Wi-Fi is slow and dropping out: why it happens and how to fix it

Have you noticed that your Wi-Fi connection is getting worse: pages are taking longer to load, videos are constantly freezing, and online games are lagging? The problem isn't always your ISP—in 80% of cases, it's router settings, interference, or outdated equipment. In this article, we'll look into it. 12 Real Reasons Your Wi-Fi Is Deteriorating, from the banal to the technically complex, and we will provide checklists for their elimination.

It's important to understand that slow Wi-Fi and no connection at all are two different issues. If the network indicator on your device shows a connection, but the speed is poor, focus on communication channels, network congestion And hardware limitationsIf the network disappears completely, check router power supply, cables And DHCP settings.

We won't advise you to "just reboot your router" - instead we'll suggest a step-by-step diagnostics method that works even for complex networks with multiple access points and mesh systemsAll recommendations have been tested on routers. ASUS RT-AX88U, TP-Link Archer C6, Keenetic Ultra and other popular models.

1. Channel congestion: why neighbors “steal” your speed

The most common reason for a drop in Wi-Fi speed is airwave congestionIn apartment buildings, dozens of routers can operate on a single 2.4 GHz channel, creating mutual interference. Even if your router supports 5 GHz, the problem remains: many devices (for example, Xiaomi smart light bulbs or Ezviz CCTV cameras) work only at 2.4 GHz and “clog” the airwaves.

How to check channel load?

• 📱 Install the application on your smartphone Wi-Fi Analyzer (Android) or NetSpot (iOS).
• 📊 Run a scan—the program will show which channels are occupied by neighboring networks.
• 🔍 Pay attention to channels with a higher signal level -70 dBm - these are strong sources of interference.

Solution:

1. Go to the router's web interface (usually at 192.168.1.1 or 192.168.0.1).
2. Go to the section Wireless → Channel Selection (names may differ).
3. For 2.4 GHz, select channels 1, 6 or 11 — they don't overlap. For 5 GHz, use channels 36-48 or 149-165 (DFS).
4. Save the settings and reboot the router.

⚠️ Attention: Channels 12-14 Radios in the 2.4 GHz band are officially banned in Russia, but some routers allow you to select them. Using these channels can cause interference to legal networks and lead to fines from Roskomnadzor.

2. Outdated equipment: when the router can't handle modern workloads

If your router is older than 5 years, there's a good chance it simply won't be able to handle modern workloads. For example, routers that only support the standard 802.11n (Wi-Fi 4) physically cannot provide higher speeds 300 Mbps on 2.4 GHz, even if the provider provides 1 GbpsAnd if 10+ devices are connected to such a router, the speed will be distributed among them, and each will get its share. 20-30 Mbps.

Critical limitations of legacy routers:

How do you know if your router is outdated?

• 🐢 The speed via cable (Ethernet) is 5-10 times higher than via Wi-Fi.
• 🔄 The router freezes when more than 10 devices are connected.
• 📶 No support for 5GHz or Wi-Fi 6 (802.11ax).
• 🔌 Missing port WAN 2.5G or 10G for high-speed Internet.

Wi-Fi speed is below 100 Mbps with 300+ Mbps plan|

The router heats up and reboots spontaneously|

No support for modern standards (Wi-Fi 5/6)|

There is no possibility to configure QoS (traffic prioritization)|

There is no "Band-Steam" (2.4+5 GHz combination) option in the web interface.

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Solution: If the router is really outdated, replace it with a model that supports Wi-Fi 6 (For example, ASUS RT-AX55 or TP-Link Archer AX21) can increase the speed by 3-5 times. For larger houses, consider Mesh systems (Google Nest Wi-Fi, Ubiquiti AmpliFi), which automatically switch devices between access points.

3. Incorrect router placement: how walls and furniture kill the signal

Even the most powerful router is useless if it is placed in the wrong place. Concrete walls, metal structures, aquariums and even mirrors may weaken the signal on 50-70%For example, if your router is in the hallway and you're using Wi-Fi in a distant room, your speed will drop 4-5 times due to multiple signal reflections.

Typical placement errors:

• 🚪 The router is hidden in a closet or behind the TV.
• 🌿 Place it next to indoor plants (the water in the leaves absorbs the signal).
• 🔌 Connected to an extension cord with interference (cheap power supplies create noise).
• 📦 Located on the floor or in a niche - ideal position at height 1.5-2 m.

Optimal router placement:

1. Put it in center of the apartment - this way the signal will be evenly distributed throughout all the rooms.
2. Avoid proximity to microwaves, cordless phones and other sources of interference at 2.4 GHz.
3. If the house has two stories, place the router on the first floor closer to the stairs—this way the signal will travel better upstairs.
4. For larger areas use signal repeaters (TP-Link RE605X) or Powerline adapters (Devolo Magic 2).

4. Firmware issues: bugs and vulnerabilities that slow down the network

A router's firmware is its "operating system," and if it's outdated or contains bugs, it directly impacts Wi-Fi speed and stability. For example, in 2023, router firmware Netgear A vulnerability was discovered that caused devices to spontaneously disconnect from the network. And in routers D-Link DIR-8xx The bug caused a 40% speed drop when connecting more than 5 devices.

How to check if your firmware is up to date:

1. Log in to the router's web interface (the login and password are usually admin/admin or indicated on the sticker).
2. Search section Administration → Firmware Upgrade (or similar).
3. Compare the current version with the latest one on the manufacturer's website.

Signs of firmware problems:

• 🔄 The router spontaneously reboots 1-2 times a day.
• 📉 The speed drops after 10-15 minutes after switching on.
• 🔒 In the router logs (System Log) errors appear kernel panic or watchdog reset.
• 📶 Devices connect to the network, but the Internet does not work (no access to DNS).

⚠️ Warning: Do not interrupt the firmware update process! If the router is disconnected during the update, it may become bricked and require a restore via TFTP server or service center.

If updating the firmware didn't help, try reset the router to factory settings (button Reset (on the back panel). After the reset, reconfigure the network—this often resolves issues with frozen settings.

5. Malware and unauthorized connections

Your Wi-Fi may be slow not because of technical issues, but because other devices have connected to the network or because one of your devices is running malware. For example, botnets (For example, Mirai) can use your router for DDoS attacks, and neighbors can “hook” into the network if the password is weak.

How to detect "extra" devices:

1. Go to the router's web interface, section DHCP Clients List or Connected Devices.
2. Check the list of connected devices. Unknown MAC addresses - a sign of a break-in.
3. Use mobile apps like Fing or NetCut to scan the network.

What to do if foreign devices are found:

Change your Wi-Fi password to a complex one (at least 12 characters, with numbers and special characters)|

Enable MAC address filtering (Wireless → MAC Filter section)|

Disable WPS function (it is vulnerable to brute force attacks)|

Update your router firmware to the latest version|

Change your network name (SSID) to hide it from scanners

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Also check your devices for viruses. For example, if Windows PC V Task Manager it is clear that the process svchost.exe or lsass.exe consumes a lot of traffic - this is a sign of infection. Use Kaspersky Virus Removal Tool or Malwarebytes for scanning.

6. Problems on the provider's side: how to distinguish your mistakes from theirs

Sometimes it's not the router's fault, but the ISP's—for example, if their equipment is undergoing maintenance or their speed is being throttled. To check this:

• 📞 Call your provider's support team and ask about problems in your area.
• 🌐 Visit the website DownDetector and check if there are any complaints about your provider.
• 📡 Connect your computer directly to the ISP cable (bypassing the router) and measure the speed on SpeedtestIf the speed is low, the problem is with your provider.

Typical "provider" problems:

⚠️ Attention: If the provider promises speeds of “up to 1 Gbps”, this is not a guarantee of stable 1000 MbpsActual speed depends on network load, cable quality, and distance to the server. According to the Law on Communications, providers are required to provide at least 10% of the advertised speed.

7. QoS settings and traffic prioritization: why torrents "eat up" the entire internet

If you have multiple devices running on your network at the same time, online games, video calls And torrents, the router distributes traffic evenly by default - and as a result, everything "slows down". Function QoS (Quality of Service) Allows you to set priorities: for example, give maximum speed to video calls and limit file downloads.

How to set up QoS on a router:

1. Go to the section QoS or Traffic Control (different manufacturers have different ones).
2. Enable QoS and select the type By Application (by applications) or By Device (by devices).
3. Set priorities:
   • 🎮 High: games, video calls (Zoom, Discord), streaming video (YouTube, Netflix).
   • 📥 Average: web surfing, social networks.
   • 🐢 Short: torrents, OS updates, backups.

Save the settings and reboot the router.

Example setup for gamers:

Priority 1 (Maximum): Ports 3074 (Xbox), 27000-27030 (Steam), UDP 500/4500 (VoIP)
Priority 2 (High): TCP 443 (HTTPS), UDP 3478-3480 (Discord)
Priority 3 (Low): TCP 6881-6889 (Torrent), UDP 161 (SNMP)

If your router does not support QoS, you can use alternative firmware, for example, DD-WRT or OpenWRTThey allow flexible traffic prioritization even on older models.

8. DNS issues: why websites won't open, but speed is fine

If Speedtest shows high speed, but websites load slowly or don't open at all - the problem may be in DNS serversBy default, providers use their own DNS, which is often overloaded or blocks some resources.

How to check and change DNS:

• 🔍 Launch the command prompt (Win + R → cmd) and enter:

  nslookup ya.ru

  If the response takes longer than 2 seconds, the DNS is slow.

• 🔧 Change your DNS to a faster one:
  • 1.1.1.1 And 1.0.0.1 — Cloudflare (the fastest).
  • 8.8.8.8 And 8.8.4.4 — Google Public DNS.
  • 77.88.8.8 And 77.88.8.1 — Yandex.DNS (works well in Russia).
• 🖥️ Setting up on the router: go to WAN Settings → DNS and enter new addresses.

Additional symptoms of DNS problems:

• 🌐 Some websites open, but some don't (error DNS_PROBE_FINISHED_NXDOMAIN).
• 🔄 Pages load in jerks: sometimes quickly, sometimes very slowly.
• 📵 When using a VPN, everything works fine.

Frequently asked questions about Wi-Fi issues

❓ Why is Wi-Fi slower than cable internet?

This is normal: Ethernet always offers higher speeds because there's no signal loss or interference. Wi-Fi loses up to 30-50% of its speed due to:

• Interference from other networks.
• Limitations of the Wi-Fi standard (for example, 802.11n maximum 300 Mbps).
• Distances between the router and the device.

If the difference is more than 50%, check your router settings or change the channel.

❓ Can a microwave affect Wi-Fi?

Yes! Microwave ovens operate on a frequency 2.45 GHz, which coincides with the 2.4 GHz Wi-Fi range. While the microwave is running, speed may drop by 20-40%. Solution:

• Use the 5 GHz band (if your router supports it).
• Don't place the router near the kitchen.
• Only turn on the microwave when necessary (just kidding 😉).

❓ How can I check if my neighbor is stealing my Wi-Fi?

Open the list of connected devices in the router's web interface (DHCP Clients List). Unknown MAC addresses — a sign of a hack. You can also:

• Turn off all your devices and see if there is still traffic.
• Use the app Fing to scan the network.
• Turn on MAC filtering in the router settings.

If you find someone else's devices, change the Wi-Fi password to a more complex one (at least 12 characters with numbers and special characters).

❓ Why does Wi-Fi only work near the router?

This is a sign of a weak signal. Possible causes:

• A low-power router (for example, models with one antenna).
• Interference from walls or other networks.
• Incorrectly selected channel or range (2.4 GHz passes through walls worse than 5 GHz).

Solutions:

• Buy signal repeater (For example, TP-Link RE605X).
• Switch to the 5GHz band (if devices support it).
• Move the router closer to the center of the apartment.

❓ Can an antivirus slow down Wi-Fi?

Yes, some antiviruses (for example, Kaspersky Internet Security or ESET NOD32) scan network traffic in real time, which can reduce speed by 10-30%. To check:

• Disable your antivirus for 5 minutes and measure the speed.
• Check your firewall settings - it may be blocking some ports.
• Add the router to your antivirus exceptions.

If your speed has increased, configure your antivirus software so that it doesn't scan local traffic.