A situation where the router suddenly starts It's bad to distribute internet, is familiar to many users. Yesterday, the speed was top-notch, videos loaded in 4K, but today, pages open with a delay, and even simple messages in instant messaging take forever to send. This kind of wireless network behavior is annoying, but rarely indicates hardware failure.
Most often, the problem lies in a combination of factors: from banal airwaves overloaded by neighboring devices to an incorrectly chosen router installation location. Wi-Fi signal — these are radio waves that are subject to attenuation and reflection, and their quality directly depends on the environment.
In this article we will take a detailed look at why Wi-Fi How to identify the source of interference and what settings can significantly improve coverage in an apartment or office. Understanding the physics of this process will help you avoid guessing and instead know exactly what to do.
Physical obstacles and router placement
The first thing you should pay attention to if The router is not distributing Wi-Fi well., is its physical environment. Radio waves at 2.4 GHz and 5 GHz interact with materials differently. Thick concrete walls reinforced with metal, mirrors, aquariums, and microwave ovens become serious barriers to the signal.
If you've hidden your router in a niche, behind a cabinet, or placed it on the floor, don't be surprised if the speed drops. The device's antennas are designed to radiate a signal in a specific area, and shielding from furniture reduces their effectiveness. Ideally, the router should be located in the center of the room, 1.5–2 meters above the floor, with a clear line of sight.
Metal structures in walls or foil-lined insulation can completely block the wave's passage. In such cases, even a powerful transmitter is powerless without repeaters or mesh systems.
⚠️ Attention: Never place your router close to a microwave oven. When heating food, it creates powerful electromagnetic interference in the 2.4 GHz band, completely jamming the wireless network for several minutes.
It's also worth considering the wall material. Drywall transmits the signal fairly well, but solid concrete with rebar reduces the signal by 10-15 dB, which is equivalent to losing half the range. If there are two such walls between you and the router, you can't expect stable performance.
The influence of neighboring networks and airwaves saturation
In apartment buildings, the airwaves are literally clogged with signals from dozens of neighboring routers. This phenomenon is called interferenceImagine being in a room with a hundred people shouting different commands at once—it becomes impossible to make out anything specific. Wireless channels behave exactly the same way.
The 2.4 GHz band is particularly vulnerable because it's narrow and has only three non-overlapping channels (1, 6, 11). If your router and your neighbors' routers are all on the same channel, data packet collisions occur, leading to retransmissions and, consequently, a drop in actual speed.
The 5 GHz band is more accessible in this regard; it has more channels and a shorter range, so neighbors often simply can't reach it. Switching to 5 GHz is one of the best solutions for multi-family buildings.
To analyze airtime congestion, you can use specialized utilities for your smartphone or PC. They will display a "heat map" of channels and help you choose the least congested ones.
How to choose a free channel?
Use the Wi-Fi Analyzer app on Android. Check which channels (1-13) have the fewest networks. In the router settings (Wireless section), change the channel mode from Auto to the selected number. Avoid channels where the neighbors' signal is above -80 dBm.
Technical limitations and equipment overheating
A router is a mini-computer with its own processor and RAM. If the device runs for years without being rebooted, errors accumulate in its memory and the cache overflows. This leads to Wi-Fi signal formally there is, but data transfer is extremely slow or interrupted.
Another critical issue is overheating. Many providers provide subscribers with budget routers in plastic cases without active cooling. In the summer or under heavy load (torrents, online games), the processor heats up and begins to throttle to avoid burning out. As a result, performance drops significantly.
Check the temperature of the device's case. If it's so hot that it's uncomfortable to hold, there's chaos inside. Ensure adequate airflow: elevate the device, clean the vents, or even install a small USB cooler.
The age of the equipment should also be taken into account. Old standards 802.11n physically cannot provide speeds higher than 100–150 Mbps in real conditions, even if the provider’s tariff allows for more.
☑️ Router overheating diagnostics
Power settings and encryption standards
Often, users or inexperienced technicians accidentally set suboptimal parameters during setup. The router interface has transmitter power settings (TX Power). If the value there is 50% or "Medium", the signal will be weak even in the next room.
Another important point is security standards. An outdated encryption protocol WEP or WPA/TKIP Not only is it unsafe, but it also limits connection speed. Modern devices can become unstable on such networks, constantly reconnecting or dropping speeds to 54 Mbps.
You need to go to the wireless network settings and make sure that the mode is selected WPA2-PSK (AES) or WPA3Mixed Compatibility Mode (Mixed) sometimes also causes problems, forcing fast devices to run in older standards mode.
⚠️ Attention: Router settings interfaces are constantly being updated. The layout of menu items may vary depending on the model (TP-Link, Asus, Keenetik) and firmware version. If you don't find an exact match, look for sections with the words "Wireless," "Wireless Mode," or "Wi-Fi Network."
Also check the channel width. For 2.4 GHz, it's best to set it to 20 MHz to avoid interference, while for 5 GHz, you can safely set it to 40 or 80 MHz for maximum speed.
Problems with drivers and network adapter
Sometimes the router isn't to blame, but the receiving device—your laptop, smartphone, or tablet. If the internet works perfectly on one device, but barely loads on another, the problem is local. This can often be resolved by updating the wireless adapter drivers.
In the operating system Windows Power saving settings can disable the adapter or reduce its power to conserve battery life. This can cause the laptop to lose the router's connection over a distance or have a poor signal.
To fix this, you need to go to the Device Manager, find your Wi-Fi adapter, open its properties, and in the "Power Management" tab, uncheck "Allow the computer to turn off this device."
It's also worth checking whether airplane mode or any VPN services are enabled, which could slow down traffic. Resetting network settings to factory defaults often helps resolve software conflicts.
Band Comparison: 2.4 GHz vs. 5 GHz
Understanding the difference between frequencies is key to a stable internet connection. Many users spend years stuck on the congested 2.4 GHz band, unaware of the free 5 GHz band.
| Characteristic | 2.4 GHz band | 5 GHz band |
|---|---|---|
| Range | High (breaks through walls) | Average (poor at passing through obstacles) |
| Workload | Very high (neighbors, Bluetooth, microwave) | Low (few neighbors use this range) |
| Maximum speed | Up to 150-300 Mbps (realistic) | Up to 800+ Mbps (realistic) |
| Stability | Low (frequent ping jumps) | High (ideal for gaming and 4K) |
If your router is dual-band, be sure to use 5 GHz for devices in the same room or across one wall. For smart home devices (light bulbs, outlets) scattered throughout the apartment, it's best to use 2.4 GHz due to its better penetration.
Modern routers can combine two networks into one with the same name (function Smart Connect), automatically switching the client to the best frequency. However, on older devices, this feature may not work correctly, and in such cases, it is better to separate the networks by giving them different names, for example Home_WiFi And Home_WiFi_5G.
When is it time to change equipment?
There are situations when software settings and rearranging furniture don't help. If a router is more than 5-7 years old, it's obsolete. Technology has advanced greatly: standards have emerged. Wi-Fi 6 (802.11ax), which can work effectively even in very noisy conditions.
Older single-antenna models simply can't provide coverage even in a standard two-bedroom apartment with concrete walls. In such cases, purchasing a new dual-band router or mesh system solves 90% of speed issues.
You should also consider upgrading if your ISP gave you a gigabit plan, but your router only has 100 Mbps ports. In this case, the cable itself becomes the bottleneck, and you won't physically get faster than 95 Mbps.
⚠️ Attention: Before purchasing a new router, make sure that the connection type (PPPoE, L2TP, IPoE) is supported out of the box by the new model. Some providers require specific settings that are not available on all consumer devices.
Why does the internet work worse in the evening than in the morning?
This is a classic example of ISP and airtime congestion. In the evening (from 7:00 PM to 11:00 PM), the network load is at its highest: neighbors are watching movies, downloading games, and scrolling through their feeds. The channels become clogged, and the ISP's equipment experiences peak loads, leading to increased ping and a drop in speed.
Does foil help boost Wi-Fi signal?
No, foil doesn't boost the signal; it only redirects it, creating a shield. This might help if you need to boost the signal in one specific room, but elsewhere the signal will be even weaker or even disappear completely. It's a workaround, not a solution.
Will resetting my router to factory settings improve my speed?
Reset (Reset) will restore the default settings. If the problem was a software glitch or incorrect settings, yes, it will help. If the problem is due to physical wear and tear, interference, or your data plan, resetting won't change anything except the Wi-Fi password.