Why Wi-Fi randomly disconnects on a Xiaomi phone: A full analysis of the causes and solutions

Problem with automatic Wi-Fi shutdown on smartphones Xiaomi (including rulers Redmi, POCO And Mi) is one of the most common user complaints. Messenger sessions are interrupted, YouTube videos constantly buffer, and online games lag due to the sudden switch to mobile data. Moreover, the problem occurs on both budget models (Redmi Note 12, POCO X5), and on flagships (Xiaomi 14 Ultra).

In most cases, it is not hardware faults that are to blame, but energy saving settings, conflicts with the router or firmware errors MIUIBut there are more serious causes, ranging from overheating of the Wi-Fi module to damage to the antenna after a fall. In this article, we'll look into these. all possible scenarios, starting with the simplest solutions (which take 2 minutes) and ending with hardware diagnostics.

⚠️ Attention: If the problem appeared after the update MIUI, check the firmware version in Settings → About phoneSome assemblies (for example, MIUI 14.0.3 For Redmi Note 11) contained critical Wi-Fi bugs that were fixed in subsequent patches.

Before digging deeper, answer one question:

1. Energy saving is the main enemy of stable Wi-Fi

By default Xiaomi aggressively optimizes background app and communication modules to extend battery life. This results in Wi-Fi turns off when the screen is locked or when the battery level is low. Models with small batteries are particularly susceptible (POCO M6 Pro, Redmi 10A).

The problem gets worse if you use modes Ultra-energy saving or "Battery" in the power settings. In these modes, the system forcibly disconnects from Wi-Fi after 5–15 minutes of inactivity, even if you're downloading a file or watching a video.

• 🔋 Disable Wi-Fi optimization: Go to Settings → Battery & performance → Battery optimization, find the application Wi-Fi (or Settings) and select No restrictions.
• ⚡ Set up power saving mode: In the same section, disable the mode Ultra-energy saving or add an exception for Wi-Fi in the battery settings.
• 📱 Check your sleep settings: IN Settings → Display → Sleep set value Never (temporary solution for testing).

If after these steps Wi-Fi still turns off, proceed to the next step.

2. Conflict with router settings

In 30% of cases the problem is not in the phone, but in incorrect router parametersSmartphones Xiaomi particularly sensitive to:

• Outdated safety standards (WEP, TKIP),
• Too high signal power (may cause the module to overheat),
• Included Band Steering (automatic switching between 2.4 GHz and 5 GHz).

The first thing to do is reconnect to the network manually, forgetting the old access point:

1. Open Settings → Wi-Fi.
2. Click on your network → Forget.
3. Please reconnect by entering your password.

If this does not help, check your router settings (access via 192.168.0.1 or 192.168.1.1):

⚠️ Attention: If you have a dual-band router, try disable 5 GHz and leave only 2.4 GHz. Some models Xiaomi (For example, Redmi 9A) do not work well with automatic switching between frequencies.

3. MIUI firmware crashes and system bugs

More than 40% of Xiaomi support requests regarding Wi-Fi drops are related to bugs in specific MIUI versions, especially after major updates. For example, in MIUI 13.0.4 For POCO F4 There was a bug that caused the phone to lose connection when moving between access points. And in MIUI 14.0.6 For Xiaomi 12T Wi-Fi disconnected after 30 minutes of inactivity.

How to check if the firmware is at fault:

1. Go to Settings → About phone → MIUI version and remember the build number.
2. Check reviews on forums (eg. 4PDA or XDA Developers) on request "phone model + MIUI version + Wi-Fi issues".
3. If the bug is confirmed, update your firmware to the latest version or roll back to a stable build.

If updating doesn't help, try reset network settings:

1. Go to Settings → System and device → Advanced → Reset settings.
2. Select Reset Wi-Fi, mobile network, and Bluetooth settings.
3. Confirm the action and restart your phone.

How to roll back firmware on Xiaomi?

To downgrade, you'll need to unlock the bootloader via the official Xiaomi website, then flash the old MIUI version via Fastboot or Recovery. This process is risky—if you make a mistake, your phone could become bricked. We recommend contacting a service center if you're inexperienced.

4. Hardware problems: overheating, antenna, Wi-Fi module

If software methods do not help, the reason may lie in physical malfunctions:

• 🔥 Wi-Fi module overheating — a common problem with phones with a metal case (Xiaomi 11T, POCO F3). When heating above 60°C, the module automatically switches off for protection.
• 📡 Antenna damage — after a fall or impact, the antenna's contact with the motherboard may be disrupted.
• 🛠️ Wi-Fi/Bluetooth chip failure — if both Wi-Fi and Bluetooth are disabled, the module itself is to blame (Broadcom or Qualcomm).

How to diagnose a hardware problem:

1. Check your phone's temperature using an app AIDA64 (chapter Sensors). If the temperature of the Wi-Fi chip exceeds 70°C, this is critical.
2. Try connecting to a different Wi-Fi network (for example, at a cafe or at a friend's house). If the problem persists, the phone is to blame.
3. Turn on airplane mode Wait for 1 minute, then turn it off. If Wi-Fi isn't restored, this indicates a faulty module.

⚠️ Attention: If your phone has been dropped or got wet, do not attempt to disassemble it yourself! In models Xiaomi The Wi-Fi antenna is often soldered to the motherboard, and careless repairs can damage other components.

5. Conflict with VPN, antiviruses and third-party applications

Some apps actively interfere with network operation, leading to Wi-Fi drops. The most common culprits are:

• 🛡️ VPN clients (For example, NordVPN, ProtonVPN) - may block traffic when changing servers.
• 🦠 Antiviruses (Avast, Kaspersky) - scan traffic and sometimes "freeze".
• 🎮 Cheats for games (For example, GameGuardian) - modify the system network settings.
• 🔄 Applications for speeding up the Internet (Internet Speed Booster) - often break routing.

How to find the culprit:

1. Start your phone in safe mode (press and hold the power button → Safe mode). If Wi-Fi is working reliably, third-party software is to blame.
2. Remove suspicious applications one by one, starting with VPN and antivirus software.
3. Check app permissions in Settings → Apps → Permissions → Change system settings.

Pay special attention to applications with permissions ADB or root - they can change the network configuration at a low level.

6. IP addressing issues (DHCP and static IP)

If the phone receives incorrect IP address If the Wi-Fi connection is interrupted or conflicts with other devices on the network, it may disconnect every few minutes. This often happens in large networks (offices, dorms), where the router's DHCP server can't keep up with requests.

Signs of a problem:

• Wi-Fi connects, but after 1-2 minutes an exclamation mark appears.
• IN Settings → Wi-Fi → Advanced status visible Connected without internet access.
• After rebooting the router, the connection is restored for a short time.

Solutions:

1. Reset IP settings:

   Settings → Wi-Fi → Tap your network → Forget
   Settings → Wi-Fi → Advanced → IP Settings → DHCP (auto)

2. Assign a static IP:

   Settings → Wi-Fi → Tap a network → Change network → Show advanced options
   In the IP address field, enter: 192.168.1.X (where X is a number from 100 to 200 that is not occupied by other devices)
   Gateway: 192.168.1.1
   DNS 1: 8.8.8.8
   DNS 2: 8.8.4.4

3. Disable IPv6: Find the option in your router settings IPv6 and deactivate it (sometimes it conflicts with MIUI).

7. When the only option left is a service center

If you have tried all the methods but the Wi-Fi is still on Xiaomi If it still turns off, you'll likely need professional diagnostics. You should contact a service center in the following cases:

• 🔧 The phone was dropped into water or subjected to strong impacts.
• 🔥 The Wi-Fi module heats up even when idle (checked via AIDA64).
• 📵 Besides Wi-Fi, Bluetooth or mobile network does not work (problem with the antenna unit).
• 🔄 After resetting to factory settings, the problem remained.

The cost of repair depends on the model:

• Wi-Fi antenna replacement: from 1,500 to 3,000 ₽.
• Wi-Fi/Bluetooth module replacement: from 3,000 to 8,000 ₽ (depending on the chip model).
• Resoldering contacts: from 2,000 ₽.

Before visiting the service:

1. Make a backup copy of your data (Settings → System & device → Backup).
2. Write down the IMEI of your phone (type *#06#).
3. Check if the warranty covers repairs (if the phone is under warranty).

⚠️ Attention: Unauthorized service centers may install non-original parts, which will lead to repeated breakdowns. Make sure the receipt indicates the make and model of the replaced module (e.g., Broadcom BCM4359 For Xiaomi Mi 11).

FAQ: Frequently Asked Questions about Wi-Fi on Xiaomi

Is it possible to fix Wi-Fi on a Xiaomi device yourself?

If the problem is software-related (settings, firmware), yes. However, if the problem is hardware-related (damaged antenna or chip), soldering equipment and experience are required. Without these skills, you risk damaging the motherboard or cables.

Why does Wi-Fi only turn off at night?

Most likely, he is to blame. night power saving mode or task scheduler V MIUI. Check the settings in Settings → Battery & performance → Power saving schedule.

The Wi-Fi works, but the speed is very slow. What's wrong?

The reasons may be different:

• The router is overloaded (check in 192.168.0.1, how many devices are connected).
• The phone is connected to a congested 2.4 GHz channel (try 5 GHz).
• On Traffic saving mode V MIUI.
• The provider limits the speed (check through Speedtest on another device).

Wi-Fi is gone after updating MIUI. What should I do?

If the update failed incorrectly:

1. Try resetting your network settings (Settings → System → Reset settings → Reset Wi-Fi, mobile networks, and Bluetooth).
2. If it doesn't help, roll back to the previous version via Fastboot (instructions are on 4PDA).
3. Report a bug at Mi Community (Official Xiaomi forum) - sometimes they roll out hot fixes.

Wi-Fi only disconnects in certain places (home, work). Why?

The problem is probably interference or incompatibility with the router. Try:

• Change the Wi-Fi channel in the router settings (for example, from 6 on 11).
• Turn off nearby devices operating on the same frequency (microwaves, wireless headphones).
• Install a signal repeater if the walls are too thick.