Xiaomi turns off itself: what to do if the phone turns off for no reason

You picked up Xiaomi to answer a message or take a photo, but the device suddenly goes out — the screen goes black, the buttons don't respond, and after a few seconds (or minutes) the phone turns on again as if nothing had happened. Sounds familiar? Unintentional shutdown is one of the most common problems with Redmi, POCO and Mi smartphones, and the causes can be hidden in hardware malfunctions and software failures.

In this article, we’ll look at all the possible reasons why your Xiaomi shuts down on its own, from a dead battery to firmware conflicts, and give you step-by-step diagnostic and repair instructions, and when to go to a service center. Importantly, some solutions require technical skills, so if you’re not sure, you’d better trust the repair professionals.

1. Battery check: the main cause of spontaneous shutdowns

In 60 percent of cases, the battery is worn out, and the Li-ion batteries in Xiaomi smartphones are designed for 300 to 500 charging cycles, after which their capacity drops by 20 to 30 percent and the voltage becomes unstable, and if the phone turns off at 20 to 40 percent charge, this is a sure sign of battery degradation.

How to check the status of the battery:

• 🔋 Use the AccuBattery app (available on Google Play) to show the actual battery capacity and wear, and if it's below 80 percent of the factory capacity, it's time to change the battery.
• 📊 Go to Settings. → Battery → Battery status: Some Xiaomi models (e.g. Redmi Note 10 Pro) display "Good" or "Replace" status here".
• 🔌 Connect your phone to charge and observe: if it turns off at 15-30% and immediately turns back on, this is a sign of a deep discharge of cells.

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If the phone turns off in the cold (below +5°C), it's not always a battery defect. Lithium-ion batteries lose up to 30% of their capacity at low temperatures. Try warming the device in your hands before use.

If the diagnosis confirmed the wear of the battery, there are two options:

1. Self-replacement – Suitable for models with removable back cover (e.g. Redmi 9A or POCO M3). Buy the original battery (the article can be found on the old one) and monitor polarity when connected.
2. Contacting the service is mandatory for smartphones with adhesive housing (Xiaomi) 12T, Redmi K50). The cost of replacement in official centers Xiaomi – from 1,500 to 3,000 ₽.

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Don't use cheap battery analogues! Low-quality batteries can swell, overheat or damage the power controller.

2.Overheating: Why Xiaomi shuts down at high temperatures

Xiaomi smartphones are equipped with a system of protection against overheating, which forcibly turns off the device at a critical temperature (usually 60-70 ° C).

• 🎮 Games (Genshin Impact, PUBG Mobile);
• 📷 Video recordings in 4K;
• ☀️ Being under direct sunlight;
• 🔌 Quick charge (33W/67W/120W),

The problem is probably overheating.

How to diagnose:

• 🌡️ Install the app AIDA64 Check the temperature of the processor (CPU) And batteries in Sensors. Normal: up to 45.°C in plain, up to 60.°C under load.
• 🔍 Check the case for battery bloating (the back cover may be lifted).
• 🕳️ Check if the air vents are filled with dust (relevant to the POCO F3, Black Shark).

Decisions:

Games | Charging | Photo/video shooting | Just in your pocket | Not overheating-->

3. Firmware failures and software conflicts

If the phone turns off without overheating and at a normal charge level, the software is to blame.

• 🐞 Beta versions MIUI (Especially on Xiaomi 13, Redmi Note 12);
• 🔄 Failed update through OTA;
• 🤖 Conflict with the custom recaveri (TWRP);
• 📱 Viruses or malicious applications.

How to fix it:

1. Reset to factory settings: Settings → About Phone → Settings Reset → Erase all data Attention: Pre-repair through Mi Cloud or Google Drive.
2. Fastboot Flash: Download the official firmware for your model from en.miui.com. Connect your phone to your PC in Fastboot mode (clip Volume Down + Power). Use the Mi Flash Tool to install the firmware.
3. Virus Removal: Install Malwarebytes and scan the system. manually remove suspicious applications.

4. Malfunctions of the motherboard and the power controller

If all previous methods did not help, the problem may lie in the hardware:

• 🔌 Damaged power controller (often after falling or getting moisture);
• 🔧 Oxidation of battery contacts;
• 🔥 Burnt voltage stabilizer (on board);
• 📶 Faulty communication module (may cause short circuits).

Critical sign of hardware malfunction: the phone turns off when connected to a charge or when vibrating (for example, during a call), in which case a diagnosis in the service is required using:

• 🔍 Microscope to check toll tracks;
• 📊 Multimeter for voltage testing;
• 🔧 Ultrasonic bath (if there was moisture).

Cost of repair:

Phone turns off when charging | Screen flashes before turning off |Corp is deformed or there are traces of oxidation |Corp is not turned on without connecting to PC-->

5. Problems with the power button and plumes

Mechanical damage to the Power button or its plume is a common cause of accidental shutdowns.

• 🔘 The button is flushing or creaking;
• 🔄 The phone is turned on / off when pressing the body;
• 📱 The screen responds to touching the button (false positives).

How to check:

1. Carefully press the power button in different directions, and if the phone turns off, the micro-switch is a problem.
2. Try turning on the phone without a power button: plug in to charge and hold Volume up + Volume down for 10 seconds.

Decisions:

• 🔧 Cleaning the button: if dirt hits it, you can gently blow with compressed air or clean with alcohol (only with the phone disassembled!).
• 🛠️ Replacement of the button: in the service it costs 800-1 500 ₽.
• 🔄 Temporary bypass: Use the Button Remapper app to reassign the shutdown function to another button (e.g. Volume Down).

adb reboot

This can temporarily “wake up” the device.-->

Conflicts with SIM-link-card

Rarely, but it happens: the phone turns off due to a malfunctioning SIM-card or modem module failures:

• 📶 The phone turns off when you call or connect to the network;
• 🔄 After extraction SIM-Card problem disappears;
• 📱 In system logs (Settings) → The phone. → Error logs are entries for "Modem crash".

How to fix it:

1. Reboot modem: Enter the dial code: ##4636##Select Phone Information → Turn off the radio, then turn back on.
2. Replacement SIM-Cards: Try inserting another SIM Or move the current slot to another slot.
3. Reset Network Settings: Go to Settings → SIM-maps and mobile networks → Resetting network settings.
4. Modem firmware: On some models (Redmi Note 11, POCO X4), you can separately flash the modem through Fastboot.

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If the phone only turns off when connected to 5G, try disabling this network in the settings.Some Xiaomi models have problems with the Qualcomm X51/X53 modem on n78 (3.5 GHz) networks.

7.When to contact the Xiaomi Service Center

There are situations when self-repair is impossible or dangerous:

• 🔥 The phone is swollen or has traces of fire on the board;
• 💧 There was contact with water (even if the phone turned on after drying);
• 🔧 Rationing is required. BGA-chip (e.g. processor or memory);
• 📱 The phone does not turn on at all (no reaction to charging, PC does not detect the device).

Official Xiaomi service centers in Russia:

Before the service visit:

1. Make a backup copy of the data (if the phone is turned on).
2. Check if the center has official Xiaomi accreditation (list on the website) mi.com/ru/service).
3. If the phone is guaranteed, do not open it yourself!

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In the service, you may be persuaded to replace "all board" instead of repairing an individual item. Always ask for a photo of the diagnostics and a detailed estimate before repairing.

FAQ: Frequent questions about Xiaomi's spontaneous shutdown