Xiaomi phone turns on and off: 7 reasons and what to do

You picked up Xiaomi to check the notifications, but instead of the usual lock screen, you saw the MIUI logo — the phone rebooted again on its own. The situation repeats several times a day, and sometimes the smartphone refuses to turn on after another “spontaneous” shutdown. Is it a software failure, hardware breakdown or a virus? And most importantly, how to return the device to stable operation?

The problem of spontaneous reboots on Xiaomi smartphones (including Redmi, POCO and Black Shark models) is more common than it seems. According to service centers, up to 15% of complaints with such symptoms are not due to physical damage, but to firmware errors or application conflicts. In this article, we will analyze all possible causes — from a dead battery to a damaged motherboard — and give step-by-step instructions for diagnosis and repair. You do not need to immediately carry the phone to the service: most problems are solved by yourself.

If the phone turns on only when connected to charging and immediately turns off after disconnecting the cable, this is a critical sign of a malfunction of the battery or power controller, in which case further manipulation of the firmware is meaningless - you need to replace components.

1. Battery check: the main cause of spontaneous shutdowns

So, to start with the obvious, batteries, it's a worn-out or damaged battery that's responsible for 60 percent of spontaneous reboots, and the fact is that lithium-ion batteries lose capacity over time, and their controller starts to misidentify their charge levels, and the phone can show 30 percent charge, and in fact the battery is discharged to a critical minimum, and the device is suddenly shut down.

How to check:

• 🔋 Visual diagnostics: see if the battery is swelling (if the phone body is deformed, this is a sure sign), and check if the back cover is warming in the area of the battery.
• 📊 Checking through the engineering menu: enter the code ##4636##, go to the Battery Information section and compare the Charge Level and Voltage. Normal voltage is 3.7-4.2 V. If it is below 3.5 V at 20% charge, the battery is faulty.
• 🔄 Discharge test: fully charge your phone, then use it without connecting to the network. If it turns off at 20-40% charge, the battery is the problem.

If the battery is swollen, immediately turn off the phone and do not use it until you replace it! Lithium-ion batteries in this state can ignite. Xiaomi models with a non-removable battery (for example, Redmi Note 10 Pro or Mi 11) will require disassembly in the service center. The cost of replacing the battery in official Xiaomi services is from 1,500 to 4000 rubles depending on the model.

⚠️ Warning: Don't buy cheap battery analogs in markets or untested online stores. Counterfeit products often have understated capacity and can damage your phone's power controller.

2. Software conflicts: viruses, applications and updates

If the battery is OK, the next likely cause is software failure, and these are divided into three categories:

1. Conflicting applications (especially optimizers, antiviruses, or high-demand games)
2. Firmware errors (for example, after a failed MIUI update)
3. Viruses or malware that overload the system.

How to diagnose:

• 🔍 Safe Mode: Press the power button, then hold your finger on the "Stop" option, and you'll be prompted to go to Safe Mode, it only runs system applications, and if the phone doesn't restart, it's the third-party software that's to blame.
• 📱 Error log: Go to Settings → The phone. → Error log (or use Mi Log Viewer from the Mi App Store) Look for entries with crash, reboot or battery keywords.
• 🔄 Reverse updates: if the problem appeared after the update MIUI, Try to revert to the previous version through Settings → The phone. → Updating the system → Three points. → Select a Service Package.

If the phone is rebooting because of the app, delete it and check the system. Use Dr.Web or Kaspersky Mobile to find viruses (download only from official sources!). Don't install antiviruses from unknown developers - they can themselves be the source of the problem.

Remove newly installed applications|Check your phone in safe mode|Update all apps through Google Play|Reset network settings (Settings) → SIM-maps and mobile networks → Resetting network settings)|Try to roll back the firmware to the previous version-->

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

Xiaomi smartphones (especially models with Snapdragon 8xx or MediaTek Dimensity processors) are prone to overheating. If the chipset temperature exceeds 60-65°C, the system forcibly shuts down the device to prevent damage to components.

• 🔥 Games or heavy-duty applications (such as Genshin Impact or Call of Duty Mobile).
• ☀️ Direct sunlight (even 10 minutes in the sun can heat the body to critical values).
• 🔌 Fast charging (especially if you use non-original power supplies).
• 💻 Multitasking (simultaneous operation of the navigator, messenger and streaming).

How to check the temperature:

1. Install the AIDA64 or CPU Monitor app.
2. Run a performance test or just use your phone as normal.
3. If the temperature of the processor is above 70°C and the battery is 45°C, this is a critical indicator.

Decisions:

• 🛡️ Limit productivity: in Settings → Battery and productivity → Select Balanced or Energy Saving Performance Mode.
• 🧊 Use cooling accessories: ventilated covers or external coolers (e.g. Black Shark FunCooler Pro).
• 🔌 Turn off fast charging: in Settings → Battery and productivity → Fast charging.

⚠️ Warning: If the phone is heated even in standby mode (e.g. at night), this may indicate a motherboard malfunction or a short circuit in the battery.

4. Damage after falling or getting moisture

Physical injuries are another common cause of spontaneous reboots, and even if the phone is intact after falling, the internal components may have shifted or become microcracked, and are particularly vulnerable to:

• 📱 Battery contacts (may be detached from the charge).
• 🔌 Power connector (if the phone falls when the cable is connected).
• 💧 Moisture sensor (if the phone has contacted water, even in small quantities).
• 🛠️ Soldered connections (for example, on a Wi-Fi module or antenna).

How to diagnose:

1. Examine the body for cracks, dents or traces of corrosion (green plaque on the contacts).
2. Check if the screen is “playing” when pressed (this is a sign of the plume detachment).
3. Connect the phone to your computer and check if it is defined as a device (if not, a problem with the device). USB-port-controller).

If the phone falls or gets wet, do not try to turn it on until it is completely dry (at least 24 hours in rice or silica gel). Turning on the wet device can short-circuit and irrevocably damage the board.

5. Resetting and flashing: extreme measures

If all previous methods failed, there are two radical solutions: factory reset or firmware reflash: the first method deletes all user data but retains the current version of MIUI. The second completely reinstalls the system, which helps with deep software failures.

How to reset:

1. Back up your data through Settings → About Phone → Backup or Mi Cloud.
2. Go to Settings → Additional → Recovery and Reset → Resetting.
3. Choose to erase all data and confirm the action.

How to check the phone:

• 📥 Download the official firmware for your model from en.miui.com (select the Stable version, not the Developer version).
• 🔧 Use the Mi Flash Tool to run through Fastboot or TWRP custom-fix.
• ⚠️ Before the firmware, unlock the bootloader through Settings → The phone. → Version. MIUI (Press 7 times) and additionally → For developers → Unlocking OEM.

Warnings:

• The reflashing will void the warranty if it is still valid.
• The wrong firmware can turn your phone into a brick.
• For models with MediaTek (e.g. Redmi 9A), Xiaomi account authorization is required.

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Before resetting or firmware, charge the phone fully (at least 60%) and connect it to a power source.

6. Hardware malfunctions: when without service can not do

If none of these methods worked, the problem is probably the hardware, and here are the most common malfunctions that require professional intervention:

• 🔌 Faulty power controller (symptoms: the phone turns on only from charging, but immediately turns off when disconnected).
• 🔋 Short circuit on the board (symptoms: the phone warms up even when turned off).
• 📶 Damaged communication module (symptoms: reboot when calling or connecting to Wi-Fi).
• 🖥️ RAM malfunction (symptoms: accidental reboots when running applications).

The cost of repair depends on the model and type of breakdown.

• Replacement of the power controller with the Redmi Note 8 Pro — ~3 500 ₽.
• Repair of the short circuit on the Mi 10T — ~5 000 ₽.
• Replacement of the memory module with POCO F3 — ~7 000 ₽.

How to choose a service center:

• 🔍 Check reviews on Yandex.Maps or 2GIS.
• 📋 Ask if you have a warranty for repairs (at least 3 months).
• 💰 Compare prices in 2-3 services (too low price can mean using unoriginal parts).

⚠️ Note: If the phone is warranty, contact only official service centers Xiaomi. self-repair or interference in third services voids the warranty.

7.Prevention: How to Prevent Re-Reboots

To prevent the problem from returning, follow these recommendations:

• 🔋 Use original chargers (especially for models with Quick Charge or HyperCharge support).
• 📱 Do not allow full battery discharge (optimal range - 20-80%).
• 🔄 Update your firmware regularly, but don’t install beta versions. MIUI.
• 🛡️ Install a reliable antivirus (e.g. Bitdefender Mobile).
• ☀️ Avoid overheating: Do not leave your phone in the sun or near heat sources.

It is also useful to perform calibration of the battery once every 2-3 months:

1. Completely discharge the phone before turning off.
2. Connect to the original charger and charge up to 100% without interruptions.
3. Disconnect from the network and use to full discharge.
4. Repeat the cycle 2-3 times.

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If the phone started spontaneously restarting after the MIUI update, try rolling back to the previous firmware version. Often crashes are caused by errors in new builds that Xiaomi fixes in subsequent updates.

FAQ: Frequent questions about Xiaomi reboots