If your Xiaomi smartphone suddenly turns off for no apparent reason, it’s not just annoying, it’s signaling potential problems, and this behavior can manifest in many ways, from instantaneous shutdown at 30% charge to cyclical reboot every 5 minutes. In 80% of cases, either a worn-out battery or firmware failures are to blame, but there are less obvious reasons - from overheating to conflicts with the battery. SIM-card.
We analyzed data from service centers and user reviews of Redmi, POCO And Mi 2023-2026 to highlight the 7 key causes of spontaneous shutdown, and in this article, you'll find not only diagnostics, but also step-by-step instructions with visual cues, compatibility tables, and warnings about typical errors. Pay special attention to the section about "false disconnection" - this is the most common problem on models with a AMOLED-screens (for example, Xiaomi 13 Pro or Redmi) K60), which is often confused with hardware malfunctions.
1. Worn or damaged battery
The battery is the first suspect if Xiaomi turns off at 20-40% charge. Lithium polymer batteries degrade over time: after 300-500 charging cycles, their capacity decreases by 20-30%, and the power controller begins to misidentify the level of charge.
How to check the wear of the battery without disassembling the phone:
- Install the AccuBattery app (available on Google Play).
- Charge your phone to 100% and use it to full discharge (without interrupting the cycle!).
- Check the Battery Health section – if the battery is below 80%, it needs to be replaced.
⚠️ Attention: On models POCO F3 And Redmi Note 10 Pro has a power controller defect, which causes the phone to display 1% charge and shut down immediately, even though the real level is 15-20.
2. firmware failures or update conflicts
Software errors are the second most common cause of spontaneous shutdowns, especially when phones are upgraded to MIUI or rooting.
Turn off when you start the camera or games (Genshin Impact, Call of Duty Mobile).
Infinite restart (bootloop) after installing the update.
- The system is not responding before shutdown.
How to diagnose the problem:
- 📱 Check the error log: Go to Settings → The phone. → Version. MIUI and tap 5 times on the kernel to turn on Developer Mode. → Additionally. → For developers, find an error report.
- 🔄 Update rollback: If the problem started after the update, go back to the previous version via Settings → Updating the system → Three points. → Select the service pack (needs a firmware file with the.zip extension).
List of “problematic” firmware for Xiaomi
| Xiaomi model | The Problem Version of MIUI | Recommended action |
|---|---|---|
| Redmi Note 12 Pro+ | 14.0.3.0 | Update to 14.0.5.0 or roll back to 13.2.6.0 |
| POCO F5 | 14.0.2.0 | Reset your settings via Fastboot |
| Xiaomi 13 Lite | 13.2.4.0 | Clear the cache through Recovery |
3. overheating of the processor or other components
Xiaomi
≥60°C
- During games (especially on Snapdragon 8 Gen 1/2)
- With fast charging (HyperCharge or Turbo Charging technologies).
In hot climates or in direct sunlight.
How to check the temperature:
- 🌡️ Install. CPU Monitor AIDA64 — They show the temperature of the cores of the processor, battery and screen.
- 🔥 If the temperature is above 50°C in plain, clean the charging connector from dust and check the heat paste (on older models, for example, Redmi Note 8 Pro).
💡
On models with Snapdragon 888 (for example, Xiaomi 11T Pro) disable the option Improved performance in battery settings – this will reduce heating by 10-15%.
⚠️ Note: If the phone turns off when charging and the case is hot at the connector USB-C, Stop using the charger immediately! This is a sign of a short circuit in the power supply chain.
4.Problems with SIM-card-slot
Faulty. SIM-card or oxidized contacts in the slot can cause the phone to be instantly turned off when:
- Attempt to call or send an SMS.
Switching between 4G/5G networks.
- Modem mode activation.
How to diagnose:
- 📶 Extract. SIM-If the problem repeats, the card is damaged.
- 🔍 Check the slot for oxidation or bent contacts (especially relevant for Redmi). 9A and POCO M3, where the slot is combined with a tray for microSD).
- 🛠️ Blow the slot with compressed air or gently clean the contacts with an alcohol tampon.
Check it out. SIM on another phone|Clear the slot contacts|Update the operator's settings in Settings → SIM-map → Network settings|Turn off automatic network selection
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5. "False shutdown" on AMOLED-screen
Xiaomi 13 Ultra
Redmi K50 Pro
The screen is completely black, but the phone vibrates when you press the buttons.
The sound continues to play (such as music or video).
Call notifications come in, but the screen doesn't respond.
The reason is a malfunction of the display driver or microcontroller backlight, most often it happens after:
- Phone drops (even from a small height)
- Firmware updates with color reproduction modes change (for example, DC Dimming).
Use of non-original chargers.
How to bring the screen back to life:
- Connect your phone to your PC – if it’s defined as a device, the problem is the screen.
- Press the power button + volume increase for 10-15 seconds to force the display driver to restart.
- If it doesn't work, reset it with Fastboot: fastboot erase cache fastboot reboot.
Hardware damage: board, plumes, buttons
If the phone turns off with a light press on the body or a turn in the hand, it is to blame:
- Detached battery plume (typical for Redmi Note 10 after falls).
Cracks on the motherboard (especially near the power connector).
- Sticky power button (contacts oxidized or dirt got).
Self-diagnosis:
- 🔧 Carefully press the back cover in the area of the camera and battery – if the phone turns off, the problem is in the plumes.
- 🔊 Listen, is there any crackling when you press the power button (a sign of oxidation).
- 📸 Take a picture of the fee for darkened areas (a sign of overheating) - for this, disassemble the phone or contact the service.
⚠️ Attention: On models POCO X3 NFC And the Redmi Note 9 Pro often leaves the power connector on the board. If you're not an experienced repairman, don't try to solder it yourself - this can lead to a short circuit!
7. Application conflicts or viruses
It is rare, but sometimes the phone is turned off because of:
Malicious software (for example, miners or spyware utilities).
Conflict with the launcher (especially if you use third-party shells such as Nova Launcher).
Failure of Google services (e.g. Google Play Services)
How to find the culprit:
- 🛡️ Run the scan through MIUI Security or Malwarebytes.
- 📊 Check the Settings. → Annexes → Permits → Autostart – Turn off autostart for suspicious programs.
- 🔄 Restart your phone in Safe Mode (click the power button) → long-tail → Safe Mode: If the problem has disappeared, the third-party app is to blame.
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If the phone only turns off when connected to Wi-Fi or mobile data, check VPN settings and certificates in Settings → Wi-Fi → Additional → Certificate Management.