When a Xiaomi smartphone suddenly turns off and on again, it can be taken by surprise at the most inopportune moment, a phenomenon known as cyclical reboot or bootloop that often indicates a software conflict or hardware failure that users experience on both new models and devices that have been in the works for several years.
You can't ignore the problem, because constant power surges can finally damage the motherboard or memory storage. In some cases, the system manages to boot to the desktop, but most often the device gets stuck on the MI logo. Understanding the root cause is the key to successfully restoring the gadget to work without contacting the service center.
Before you carry your phone to the wizard, you should rule out software errors that occur after a failed update or installation of dubious applications. Often the cause lies in overflow of the system partition or driver conflict. Below we will discuss in detail the diagnostic algorithms and methods for troubleshooting various degrees of complexity.
Programmatic failures and conflicts in MIUI
The most common cause of spontaneous reboots is the unstable operation of the Android operating system with the MIUI shell. Errors in the code of applications or system processes can cause critical failures, known as kernel panic, after which the device goes into restart to protect data, especially after installing beta versions of firmware.
If the phone starts to behave insecurely right after the upgrade, it may be that the firmware file was corrupted when it boots or that the installer has experienced partition incompatibility, and in this case the system tries to compensate for the error but goes into an endless loop, and it's important to check if there's an application that requires superuser rights or deep integration into the system.
How to check system logs without root rights
To eliminate software conflicts, it is recommended to clean the cache or completely reset the settings. However, before you try to remove the recently installed programs. If access to the menu is not possible, you will have to use Recovery mode.
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More than 60% of Xiaomi cyclical reboots are caused by third-party application conflict or errors after the MIUI update.
Power button problems and mechanical damage
Physical damage to the case often causes Xiaomi to reboot itself. The mechanical power button wears out over time, and its contacts can close inside the case, and even a slight touch or vibration in the pocket can trigger a signal to turn on or restart the device.
You can check the condition of the button visually and tactilely. If it fails, fuses or has a backlash, the probability of mechanical closure is high, and it is also worth examining the case for traces of falling or getting moisture that could oxidize the plumes and contacts on the board.
- 🔘 The power button has visible damage or stuck in the pressed state.
- 💧 The device recently got water or it was in high humidity conditions.
- 📱 The body of the smartphone has severe deformation after falling.
- 🔌 The charging connector is shattered and causes a short circuit when the cable is connected.
A temporary solution may be to fix the button neatly inactive, but to completely fix the problem will require replacing the power button module or the plume. In some Redmi and Poco models, the button plume is combined with the bottom charging connector, which makes repair easier.
Lack of memory and overflow of the system partition
Critical overflow of internal memory is another common cause of unstable work: When free space in the system partition falls below 100-200 MB, the Android operating system stops correctly writing temporary files and logs, which leads to fatal errors and forced reboot.
This is especially true on devices with 32 or 64 GB of internal memory, where users rarely clean, and the system tries to free up resources, but because of the lockdown of the cleaning processes, it goes into a receptacle, and if the phone is able to turn on, the first thing you need to do is to free up space.
It is recommended to remove the cache of heavy applications such as Telegram, WhatsApp or Instagram, and transfer photos and videos to a memory card or cloud storage.
☑️ Emergency memory cleanup
Battery degradation and power problems
Wearing of a lithium-ion battery is a natural process that can lead to unexpected shutdowns. When the residual capacity of the battery drops below a critical level, it is not able to produce the necessary current during peak load times, such as when the camera is starting or demanding play. The voltage drops sharply, and the phone turns off.
Often, these shutdowns look like a reboot, especially if the device is immediately put on charge. You can check the status of the battery through the engineering menu or special monitor apps. Pay attention to the voltage: if it jumps under load, it is time to change the battery.
The problems may also be related not to the battery itself, but to the power controller on the motherboard. Oxidation of the contacts or failure of the charging circuit elements lead to unstable voltage, which is perceived by the system as a signal to an emergency shutdown.
⚠️ Warning: If the battery is swollen or the phone is very warm in the battery area, immediately stop using the device.
Errors after firmware updates and resetting settings
If the problems started immediately after the MIUI update, the new firmware version may contain bugs that are incompatible with your hardware. Developers sometimes release raw updates that cause driver conflicts, in which case waiting for a patch or rollback to a stable version helps.
A radical but effective method of solving software problems is a complete reset to factory settings (Wipe Data), which removes all user data, applications and settings, returning the phone to the “out of the box” state, which eliminates the influence of third-party software.
To perform the reset via the recovery menu:
- Turn off the device completely.
- Press the button combination Volume up + Power (for some models Volume down + Power).
- In the menu that appears, select English/Chinese and go to Wipe Data.
- Confirm the action and wait for the process to end.
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Before performing a full reset, be sure to back up important contacts and photos, as it will be impossible to recover deleted data without a backup.
Diagnostics of hardware faults
When software methods fail, you suspect a hardware breakdown, which may be a processor's departure from the board (often after a fall), a memory module malfunction, or a radio module problem, and only a multimeter and power supply specialist can make an accurate diagnosis.
The table below provides the main symptoms and probable causes for various device behavior scenarios:
| Symptoms. | Probable cause | Difficulty of repair |
|---|---|---|
| Cycle on the MI logo | Firmware failure, data partition damage | Low (flashing) |
| Turn off when the camera starts | Battery wear, power surge | Low (replacement of the battery) |
| Reboot on a call | Failure of the antenna module or amplifier | Medium (sweatering) |
| Chaotic reboots in simple | CPU dump, CZ on board | High (rebolling/replacement of fees) |
If the device is warranty-free, do not attempt to open it yourself, and if there are traces of autopsy or damage from careless handling, it will be grounds for denial of warranty service.
⚠️ Warning: Attempts to firmware a device via Fastboot with the wrong version of the region (Global instead of China or vice versa) can lead to a bootloader lock or complete failure (brick).