Why Xiaomi smartphone spontaneously reboots: a full analysis of the causes and solutions

Your Xiaomi has suddenly started to reboot for no apparent reason — whether during a call or in standby mode? — This problem is familiar to many owners of the brand’s smartphones, from budget Redmi to flagship Mi or POCO. Spontaneous reboots are not only annoying, but also signal serious problems, from software failures to critical wear of iron.

In this article, we will systematically analyze all possible causes of cyclic reboots, from the most innocuous (for example, application conflict) to the fatal (a bloated battery or a damaged motherboard), you will learn how to diagnose the problem yourself, which settings to check first, and when to carry the phone to the service center.

Spoiler: 60 percent of the time, software (MIUI, firmware, apps) is to blame, but you can't ignore hardware factors, especially if the phone isn't new anymore, so let's start with the simplest and gradually move on to the more complex.

1. Software failures: MIUI, firmware, and application conflicts

The first thing to rule out is firmware issues. Xiaomi smartphones are known for their customized Android (MIUI shell), which sometimes behaves unpredictably, especially after major updates or when using beta versions of the software.

Typical scenarios:

• 📱 The phone is rebooted when a particular application is launched (most often games, instant messengers, or banking programs).
• 🔄 Cyclic rebut occurs after a fixed time interval (e.g., every 10-15 minutes).
• 🔋 Reboot occurs when charging is connected/disabled or when the battery level is low.

How to check:

1. Run your phone in Safe Mode (hold the power button → long tap on "Stop" → "Safe Mode"). If the reboots stop, the third-party app is to blame.
2. Check out the MIUI version in Settings → About Phone. If it’s a beta firmware (labeled as Developer or Stable Beta), rolling back to a stable version could fix the problem.
3. Open Settings → Applications → Application Management and sort by installation date. Remove recently added programs.

⚠️ Warning: If the phone only reboots when connected to a computer, the problem may be the ADB drivers or the conflict with the antivirus on the PC. Try using another USB- cable or port.

2.Failures after the MIUI update: how to roll back to the old version

One of the most common causes of spontaneous reboots is a failed MIUI update, especially for devices that receive air-to-air updates (OTAs), and sometimes new firmware contains critical bugs that cause an endless cycle of bootloops.

Signs of a problem:

• 📉 The phone started restarting immediately after installing the update.
• 🔄 The Mi or Redmi logo appears on the screen, followed by a rebut, and so on in a circle.
• 📱 In Settings → The phone has a new version MIUI, but the system is unstable.

Decisions:

1. Hard Reset: Press Volume Up + Power before Recovery menus appear. Select Wipe Data → Wipe All Data. Attention: This will delete all data!
2. Download stable firmware for your model from en.miui.com, then run it through the Mi Flash Tool in fastboot mode.
3. Manual OTA installation: If the phone is sometimes booted, download the full service pack (.zip) and install it through Settings → About Phone → System Update → Three Points → Select the service pack.

Download the correct version of MIUI for your model |

Check battery power (minimum 50%) |

Install Xiaomi drivers on PC|

Backup important data (if the phone is still on) |

Prepare. USB-cable (preferably original)

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If the problem has disappeared after the rollback, stay tuned. The next version of MIUI may fix the bug. If not, consider switching to custom firmware (e.g. Pixel Experience or LineageOS).

3. Battery problems: bloating, wear and power controller

If your Xiaomi is older than 2-3 years, the first hardware reason for reboots is a worn-out battery. Over time, lithium polymer batteries lose capacity and begin to behave unpredictable when loaded or low charge.

Symptoms:

• 🔋 The phone turns off or reboots at 20–30% charge, although the indicator shows a normal level.
• 🔥 The body is swollen or deformed (especially when you put the phone on a flat surface and spin it).
• ⚡ Reboots occur when a charge is connected or when a voltage drops sharply (e.g. when the camera starts).

How to diagnose:

1. Check the battery status through the engineering menu: type ##4636## → Battery information. Pay attention to the parameters Charge level, voltage and temperature.
2. Use the AccuBattery app (available on Google Play) to analyze wear and tear, and if the battery is below 70% healthy, it's time to change it.
3. Visually inspect the battery (when disassembling the phone). Bloating, corrosion or damage to the shell - direct indications for replacement.

⚠️ Warning: If the battery is swelling, you can't keep using the phone! This could cause a fire or explosion. Disable the device immediately and call the service.

The cost of replacing the battery in Xiaomi varies from 1,500 to 4000 rubles depending on the model. For popular devices (for example, Redmi Note 10 Pro or POCO X3) you can find original batteries on AliExpress or in local service centers.

4. CPU overheating: why Xiaomi goes into rebut when loaded

Another common cause of sudden reboots is thermal throttling. Xiaomi smartphones, especially on Qualcomm Snapdragon processors (such as the Snapdragon 720G or 865), are prone to overheating under intense loads:

• 🎮 Long gaming sessions (PUBG Mobile, Genshin Impact).
• 📷 Record video in 4K or use a camera at high temperatures.
• 🔄 Multitasking with a lot of background processes.

How to check the temperature:

1. Install the CPU Monitor or AIDA64 app to monitor the CPU temperature.
2. Run a stress test (e.g., in 3DMark or Geekbench) and monitor your performance.
3. If the temperature is above 85-90°C, the protection is triggered and the phone is rebooted.

Decisions:

• 🧊 Use cooling stands or radiator covers (e.g. Black Shark Cooler).
• 🔧 Clean your phone of dust (especially important for active cooling devices like POCO F3).
• ⚙️ Turn off background activity of unnecessary apps in Settings → Battery → Optimizing the battery.
• 📱 Install a custom core with improved thermal management (e.g., FrancoKernel for Snapdragon).

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If the phone overheats even in plain, check the heat paste between the processor and the radiator, which can be replaced with a more efficient one (for example, the Arctic MX-4).

5. Hardware malfunctions: board, plumes, power button

If the software didn't work, the problem is the hardware, and here are the most vulnerable components.

Power Button (Power Button):

• 🔘 If the button is stuck or oxidized, the phone may perceive it as a prolonged press and reboot.
• 🔧 Solution: disassemble the phone and clean the button with alcohol. If the mechanism is broken, you need to replace it.

Damaged motherboard:

• 🔌 Short circuits, burnt capacitors, or damaged tracks can cause spontaneous reboots.
• 🔍 Diagnosis: Examine the board for darkening, swollen capacitors, or traces of oxidation.

Retreated plumes:

• 📶 Often, after a fall or disassembly, the plumes of the display, battery or antenna depart, resulting in power loss.
• 🛠️ Solution: gently press the plumes or replace them (in the service it costs 500-1 500 rubles).

4 Faulty memory module (eMMC/UFS):

• 💾 If the phone hangs on the Mi logo or reboots while reading/write files, memory degradation is possible.
• 🔧 Check memory health through ADB: adb shell su cat /proc/mtd Or use the DiskInfo app.

⚠️ Warning: If the phone doesn't turn on at all or goes into fastboot without you, it could be a sign of a burnt BootROM (on Snapdragon) or a damaged EDL- mode (on Mediatek), in which case only flashing through test points in the service will help.

6. Viruses and Malware: How to Check and Remove

It is unlikely, but possible: some viruses can mimic hardware failures, causing reboots, especially users installing applications from unverified sources (APK- files from torrents or third-party sites).

Signs of infection:

• 🦠 The phone is rebooted when you open a browser or a specific site.
• 📱 Unknown apps appear on the menu or pop-ups with ads.
• 🔋 The battery goes down much faster than usual (a virus can mine cryptocurrency in the background).

How to treat:

1. Install an antivirus (Malwarebytes, Dr.Web or Bitdefender) and perform a full scan.
2. Check the list of installed apps in Settings → Apps. Uninstall suspicious ones (especially with names like System Update, Flash Player or Cleaner).
3. Reset your phone to factory settings (see Hard Reset section above).
4. If the virus blocks access to settings, run your phone through fastboot (instructions in section 2).

7 Conflicts with SIM- card or SD- card

Rarely, but aptly, a faulty SIM- card or microSD can cause phone malfunctions, up to and including reboots, due to read/write errors or conflicts in the communication module.

How to check:

• 📱 Remove the SIM- card and check if the reboots are continuing.
• 💾 If you use a microSD, remove it and test the phone without it.
• 🔍 Inspect the trays for damage or oxidation of the contacts.

Decisions:

• 🔄 Reinstall SIM- card to another slot (if there are two).
• 📱 Format the SD- card on your PC (use FAT32 or exFAT).
• 🛠️ If the contacts are oxidized, clean them with a blower or alcohol.

If the problem disappears after the card is removed, replace it. The cost of a new SIM in communication salons usually does not exceed 100-200 rubles.

8.When to contact the service: signs of serious breakdowns

If you’ve tried all the techniques in this article, but Xiaomi continues to reboot, it’s time to bring it to the service.

• 🔥 The phone heats up to the point of being unable to hold it in your hand even without loading.
• 💥 Reboots are accompanied by claps, sparks or the smell of burns.
• 🔌 The device does not turn on at all or goes into fastboot/EDL without responding to buttons.
• 📵 The antenna is completely out of order (no network, Wi-Fi or Bluetooth).
• 🔋 The battery is swelling or leaking.

The cost of repair in official Xiaomi services:

Before the service visit:

1. Backup the data (if the phone is still on).
2. Check if the service has original parts for your model.
3. Check if the warranty period has expired (in this case, the repair may be free).

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If the phone is warranty, DO NOT disassemble it yourself! opening the case will void the Xiaomi warranty.

FAQ: Frequent questions about Xiaomi reboots