Xiaomi smartphone turns on and off itself: diagnostics and repair

Your Xiaomi has started to behave like a “ghost”: it turns on without you, then suddenly shuts out in the middle of work? This problem is familiar to many owners of Redmi, POCO and Mi smartphones – from the budget Redmi 9A to the flagship Xiaomi 13 Ultra. Symptoms can manifest themselves in different ways, from one-time “glitches” to the complete inability to use the device due to endless reboots.

80% of the time, it's not a malfunction, it's a software failure or a misset, but you can't ignore it: constant reboots cause flash memory wear, processor overheating, and even battery damage. In this article, we'll look at all the possible causes, from a simple system freeze to hardware malfunctions, and give you step-by-step instructions for troubleshooting.

Before you bring your phone to the service (which will cost you 500 rubles), try going through our checklist, and we’ve put together solutions that have helped thousands of users on 4PDA, Mi Community, and XDA Developers forums, from simply resetting the cache to flashing it through Fastboot.

1. Battery check: the main cause of spontaneous shutdowns

If Xiaomi turns off at a charge level of 20-40% or loses interest sharply, the battery is to blame in 95% of cases. Modern lithium-polymer batteries degrade after 300-500 charging cycles, and in budget models (Redmi 8A, POCO M3) their life is even less.

• 🔋 The phone turns off when 15-30% charge, but after charging shows 0%
• 🔥 The body warms up in the battery area even without loading
• ⚡ Charging jumps (for example, from 40% immediately by 15%) or “stuck” at one value
• 🔄 The device is switched on only from the charger, but turns off when disconnected

How to check the status of the battery without disassembling the phone:

1. Enter the code ##4636## → select Battery Information.
2. If you look at Battery Health, if it's below 80 percent, you should change the battery.
3. Use apps like AccuBattery (available on Google Play) to track real capacity, like if it was 5,000mAh, and now it's 3200mAh, which is critical wear.

⚠️ Warning: Don't use the magic apps to calibrate the battery from the Play Market. They don't restore capacity, they just reset the controller data, which can make the problem worse.

If the battery is swollen (the phone body is "unplugged"), immediately turn off the device and do not use it until the battery is replaced - the risk of fire! In Xiaomi with a fixed lid (for example, Redmi Note 10 Pro) to check the battery will have to remove the rear panel - this can be done yourself with a suction cup and a plastic blade, but it is better to contact the service.

2. Software failures: when firmware or applications are to blame

If the Xiaomi phone turns on and off, hovers on the MIUI logo, or reboots at random, the problem is likely software.

• 🤖 System failure after update MIUI (Especially important for beta versions)
• 📱 Application conflict (most often to blame optimizers, antiviruses or games with root access)
• 🗑️ Overflowing cache or corrupted files in the section /data
• 🔄 Incorrect energy saving settings (for example, aggressively shutting down background processes)

The first thing you need to do is boot in safe mode, which will help you to understand whether third-party software is to blame:

1. Turn off the phone.
2. Press the Power button and hold until the MIUI logo appears.
3. Once the logo appears, immediately press and hold the Volume Down button until the phone boots up.
4. In the lower right corner of the screen should appear the inscription Safe Mode.

If you're in safe mode, the phone is stable, the problem is in one of the apps you've installed.

1. Remove recently installed programs (especially optimizers like Clean Master or DU Speed Booster).
2. Turn off auto-start for all applications in Settings → Apps → Auto-Start.
3. Check permissions for applications in Settings → Privacy → Permits.

Boot in safe mode|Remove suspicious applications|Clear the system cache|Disable energy saving for critical applications|Viruses Checked for Dr.Web-->

3. Settings reset: Last chance before flashing

If Safe Mode doesn't work, the next step is hard reset, which will delete all the data from the phone, but often solves the problems with cyclic reboots. Importantly, before reset, try saving data via Mi Cloud or connecting the phone to your PC.

How to make a reset on Xiaomi:

1. Turn off the phone.
2. Press the Power and Volume buttons for 10-15 seconds at the same time until the Recovery menu appears.
3. Use volume buttons for navigation and power button for selection.
4. Select Wipe Data → Wipe All Data (on some Factory Reset models).
5. Confirm the action and wait for the process to be completed.
6. Choose Reboot. → Reboot to System.

⚠️ Note: On some models (POCO F3, Redmi K40) After the reset, you may need to enter a Mi Account tied to your phone. If you do not remember the data, use the official Xiaomi site to restore access.

If the reset didn't work, the problem might be the damaged firmware, and then you'd only need to flash it over Fastboot or Recovery, and you'd need to:

• 💻 Computer with drivers installed ADB/Fastboot.
• 🔗 Official firmware for your model (you can download it on the Xiaomi website).
• 🔌 Cable USB Type-C (preferably original).

4.Overheating: Why Xiaomi is switching off from high temperatures

Xiaomi can spontaneously turn off when overheating - this is a protective mechanism that prevents damage to the processor. Normal operating temperature for smartphones Snapdragon or Mediatek - up to 45 ° C. If the temperature exceeds 50-55 ° C, the system forcibly cuts off power.

Causes of overheating:

• 🔥 Games or heavy applications (e.g. Genshin Impact, Call of Duty Mobile).
• ☀️ Direct sunlight or hot weather (especially important for phones in black case).
• 🔋 Faulty battery or charger (for example, using cheap cables without protection).
• 🛠️ Thermopast on the processor dried (relevant for older phones) 2-3 years).

How to check the temperature:

1. Install the AIDA64 app or CPU Monitor from Google Play.
2. Run a heating test or just play the game for 10-15 minutes.
3. Check the temperature of the processor (CPU) and battery (Battery).

If your phone is overheating even in a simple situation, try:

• 🧹 Clean the charging connector and ventilation holes (dust interferes with heat removal).
• 🔄 Turn off automatic brightness and set the value manually on 50-60%.
• ❄️ Use a cooling cover or fan (e.g. Black Shark Cooler).
• 🛠️ In extreme cases - replace the thermopaste (requires the breakdown of the phone).

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If the phone gets hot when charging, try using Xiaomi's original Quick Charge-enabled adapter. Cheap charging often doesn't have overheat protection.

5. Hardware malfunctions: when without service can not do

If all the software methods have been tried, and Xiaomi is still turning on and off, the problem is probably hardware.

• 🔌 Faulty power button (contacts stick or oxidized).
• 🔋 Short circuit on the motherboard (often after falling or getting moisture).
• 📶 Problems with antenna module (may cause reboots when searching for a network).
• 🖥️ Memory malfunction (the phone “forgets” the current state and restarts).

How to diagnose hardware problems:

1. Check the power button: press it several times – if it “fails” or clicks fuzzy, it should be cleaned or replaced.
2. Check your phone for moisture: if there are traces of corrosion on the charging connector or under the lid, this is a sign of water getting in.
3. Check the work without SIM-maps: if the reboots stopped - a problem in the communication module.
4. Connect to a PC: If the phone is defined as Qualcomm HS-USB QDLoader 9008 is a sign of “bricking” (requires firmware through the EDL-regime).

⚠️ Warning: If the phone fell into the water or was subjected to severe blows, do not try to disassemble it yourself - without experience you can damage the plumes or chips. In such cases, it is better to contact the Xiaomi service center (addresses can be found on the official website).

Cost of repair of hardware faults:

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If the phone only turns on when the charger is connected, but turns off when it disconnects, that's a 100% battery or power controller problem, and you can't repair yourself without special equipment.

6.Fastboot firmware: When nothing helps

If Xiaomi only loads to the MIUI logo or is constantly rebooted, a full Fastboot flashing may be required.This method is suitable for power users, as if the phone is mistaken, it can be turned into a “brick”.

What you need:

• 💻 Windows computer 7/10/11 (Mac or Linux may have driver problems).
• 🔗 Fastboot firmware for your model (download from the official website).
• 🛠️ Mi Flash Tool (the latest version can be found on the forum) MIUI).
• 🔌 The original cable. USB Type-C (important! Cheap cables may not be transmitting data to Fastboot).

Step-by-step:

1. Unpack the archive with firmware in a folder without Cyrillic characters (for example, C:\Xiaomi\fastboot_rom).
2. Install the Mi Flash Tool and ADB/Fastboot drivers.
3. Turn off your phone and press Power + Volume Down to log into the Fastboot.
4. Connect your phone to your PC. The Android Bootloader Interface should appear in the Device Manager.
5. Launch the Mi Flash Tool, press Select and specify the path to the firmware folder.
6. Select Clean All mode and press Flash.
7. Wait until it is completed (usually 5-10 minutes).

⚠️ Note: If an anti-roll back error appears during firmware, it means you are trying to install an older version. MIUI, It's better than the one on the phone, so you need to download a newer firmware or use it. EDL-Mode (requires an authorized Xiaomi account).

If the firmware is successful, but the phone is still restarted:

• 🔄 Try to flash another version. MIUI (For example, instead of global, take EEA).
• 📱 Install custom restoration TWRP and stitch through Custom ROM (For example, Pixel Experience or LineageOS).
• 🛠️ Contact the service – perhaps a problem in the hardware (for example, damaged flash memory).

7. Frequent questions and answers