Owners of smartphones Xiaomi, Redmi and POCO Often, they face a problem when the device spontaneously turns off – whether it is during a conversation, playing, or just in standby mode. The reasons can be both hardware malfunctions (such as a worn-out battery) and software failures (from firmware errors to application conflicts). 20-30%, This is almost always a signal of a battery failure, and if it turns off on a full charge, either the firmware or the power controller are to blame.
In this article, we will analyze all possible causes, ranging from banal overheating and ending with rare hardware defects (for example, detachment of the battery plume). You will learn how to diagnose the problem yourself, which settings to check first, and when exactly to contact the service center. 11/12/13 series, Redmi Note 10/11/12 and POCO F3/F4/F5, where the problem is most often encountered.
⚠️ Warning: If the phone turns off when connected to a charge (especially wireless), immediately stop using the charger! this may indicate a short circuit in the power supply chain - a risk of fire or damage to the motherboard.
1. Worn or damaged battery
The most common cause of spontaneous shutdown is a degraded battery. The Li-ion batteries in Xiaomi smartphones are designed for 300-500 full charge cycles, after which their capacity drops by 20-30%. If your phone is older than 2-3 years, the probability of battery wear is closer to 80%.
How to check:
- 🔋 Use the AccuBattery app (free on Google Play) to show the actual battery capacity and wear, and if the capacity drops below 80 percent of the factory capacity, the battery is replaced.
- 📉 See the graph of the discharge in Settings → Battery → Battery use: Sharp jumps in charge level (e.g., from 40% to 1% per minute) - a sign of malfunction.
- 🔥 If the phone gets hot when charging or discharges quickly in cold weather, these are also symptoms of a “dying” battery.
⚠️ Note: Some Xiaomi models (e.g. Redmi Note 8 Pro or Mi) 9T) If the phone body becomes convex or the buttons are not pressed well, turn off the device immediately and contact the service!
| Xiaomi model | Typical battery life | Signs of wear and tear |
|---|---|---|
| Redmi Note 10/11 | 2-2.5 years | Turns off at 15-30%, fast discharge in games |
| Xiaomi 11T/12 Pro | 2 years | Overheating during charging, jumps in the level of charge |
| POCO F3/F4 | 1.5-2 years | Turns off in the cold, does not keep the charge in standby mode |
| Mi A2/A3 | 3+ year-end | Battery bloating, spontaneous reboots |
2. Firmware failures or software conflicts
Software bugs are the second most common cause of sudden shutdowns, especially after a MIUI update or custom firmware installation, for example, MIUI 14 had a bug that caused the Xiaomi 12 and Redmi K50 phones to shut down when Performance Mode was activated.
How to diagnose:
- 🔄 Check if there is a problem after the update. If so, try to roll back to the previous version. MIUI through settings → The phone. → Updating the system → Three points. → Select a Service Package.
- 📱 Set error logs using Logcat Extreme.Look for lines with shutdown, battery or thermal.
- 🚫 If the phone turns off when a particular app is launched (like Genshin Impact or Google Maps), try clearing that app's cache or rolling it back to a previous version.
⚠️ Attention: On models POCO X3 The Pro and Redmi Note 9 Pro had a common core conflict problem that caused the phone to shut down at high load, solved by turning off the cores in the engineering menu (but requires root rights!).
How to enter the engineering menu on Xiaomi?
3. overheating of the processor or other components
Xiaomi is known for its tendency to overheat, especially models with Snapdragon 8xx processors (such as the Xiaomi 12 Pro or Black Shark 4).If the chipset temperature exceeds 60-65°C, the system forcibly shuts down the phone to avoid damage.
How to check:
- 🌡️ Install the app AIDA64 And look at the CPU temperature in Sensors. Normal: up to 45.°C in plain, up to 60.°C under load.
- 🎮 If the phone is turned off during games (for example, Call of Duty Mobile or PUBG), Try to lower your graphical settings or turn on Game Mode in the settings MIUI.
- ☀️ Avoid using your phone in direct sunlight or in a stuffy room.Some models (like the Redmi Note 10 Pro) have a weak thermopaste between the processor and the radiator.
💡 Useful tip: If your Xiaomi is overheating, try turning off background activity for resource-intensive applications. → Annexes → Application management → Auto-start and disable unnecessary programs.
☑️ What to do when Xiaomi overheats
4. Failure of the power controller or battery plume
If the battery is fine and the phone is still off, the problem may be in the power controller (PMIC) or battery plume, which are responsible for power distribution and communication between the battery and the motherboard. For example, in the Xiaomi Mi 10 and Mi 11, there was a common problem with the detachment of the plume, which caused the phone to lose contact with the battery and turn off.
Signs of malfunction:
- ⚡ The phone turns off when charging is connected (especially wirelessly).
- 🔌 Charging is jerking or interrupted.
- 📱 The screen displays a message saying, "Charging suspended. Battery temperature too high/low," even though the temperature is normal.
⚠️ Warning: If you suspect a power controller problem, don't try to repair it yourself! it requires soldering work and specialized equipment. PMIC It'll cost you 3,000 to 8,000. ₽ model-wise.
5. Problems with charger or cable
Cheap or uncertified chargers can cause power surges that force the phone to shut down, especially for fast-charging models (e.g., Xiaomi 11T Pro with 120W or Redmi Note 12 Pro+ with 67W).
How to check:
- 🔌 Try charging your phone with the original Xiaomi charger. If the problem is gone, it's the cable or power supply that's to blame.
- 📊 In the Ampere app (from Google Play), check the charging current, if it jumps from 500 mA to 2 A, the cable or connector. USB-C damaged.
- 🔋 If the phone only turns off when wirelessly charging, check the charging station compatibility.Some Xiaomi models don't support the Qi 1.3 standard.
💡
If you POCO F3 Xiaomi 11 Lite, never use a charge higher than the 33W, Even if the phone supports them, it speeds up battery wear in the 2-3 once!
6. Viruses or malware
Rarely, it happens that the phone turns off due to viruses or mining bots that overload the processor, especially devices with unlocked bootloader or installed APKs from unverified sources.
How to check:
- 🛡️ Install Malwarebytes or Dr.Web Light and scan the system.
- 📊 Look at the active processes in Settings → Annexes → If there are unknown services (e.g. com.android.system.update), it could be a virus.
- 🔄 Do a factory reset (but save data first!) this will help if the problem is in system files.
⚠️ Note: Some Xiaomi models (e.g. Redmi) 9A or POCO M3) viruses disguise themselves as system updates. APK-files obtained through links from SMS messenger!
Hardware defects: from motherboard to power button
If all previous methods did not help, the problem may be physical injuries:
- 🔧 Faulty power button (for example, after a fall) on Redmi Note 8 and Mi models A3 It's a common problem.
- 🔌 Oxidation of contacts on the motherboard (if the phone was in the rain or in conditions of high humidity).
- 📱 Damage to memory chips (for example, after a failed repair).
💡 Key takeaway: If the phone turns off when it vibrates (like when you ring) or when you press the case, it almost always indicates mechanical damage to the board.
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If the phone turns off when connecting headphones or charging, the problem may be in the connector. USB-C. Its replacement will cost 1,500-3,000 ₽ model-wise.