When a Xiaomi or Redmi smartphone suddenly turns off and on again, it can be taken by surprise at the most inopportune moment.This phenomenon, often referred to as a “cyclical reboot” or bootloop, signals that the MIUI or HyperOS operating system is facing a critical error that cannot be handled by regular means. Device owners often panic, believing that the gadget is finally out of order, but in most cases the problem is solved by software methods or replacing inexpensive components.
The reasons for this behavior can be hidden in both the software and hardware, whether it’s a conflict of a newly installed application, a crowded memory, or even a banal sticking of the on button due to dust getting inside, Diagnosis requires the consistent exclusion of factors ranging from the simplest actions like cleaning the cache to complex procedures like flashing.
In this article, we will take a look at all the possible scenarios for why your phone is not stable. We will look at the hidden settings of the system, check the battery status and learn how to read system logs. Understanding the root of the problem will help you save time and money by avoiding unnecessary visits to the service center for expensive repairs.
Program conflicts and operating system errors
The most common cause of spontaneous reboots is a software glitch. The MIUI or HyperOS operating shell is based on the Android kernel, which is sensitive to system file corruption. This can happen after a failed Airborne Update (OTA) when the process is interrupted due to a power surge or poor Internet connection, resulting in system libraries being damaged and the phone goes into a reboot cycle.
Third-party applications are often the culprit, especially those that require deep access rights or run in the background, consuming a lot of resources. If you notice that the problem started immediately after installing a program, it is likely that it conflicts.
To fix software errors, the first thing to do is to analyze when exactly the crashes started. If the phone restarts in standby mode, it may be the system alarm or data synchronization that is to blame. In the case when the camera or heavy application is running, the problem lies in the drivers or the lack of RAM.
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Before you start any manipulations, be sure to back up your important data via Mi Cloud or Google Drive, as some treatments can result in the complete deletion of information.
Special attention should be paid to the cache of the system. Accumulated temporary files can contain errors that interfere with the normal loading of OS modules. Clearing the cache through the recovery menu often helps to shake up the system and remove logical errors without affecting your personal photos and contacts.
Problems with physical buttons and body
One of the most insidious and often ignored reasons is mechanically sticking the power button. In Xiaomi smartphones, the power button is structurally linked to a plume that can oxidize or become contaminated over time. If the button is stuck in the internal position, the system perceives this as a prolonged retention, which causes the command to reboot or turn off.
It's pretty easy to check this out: gently press the power button and listen to the click. If the button's motion is tight, it falls inwards or, conversely, does not give a characteristic elastic click, the problem is probably in the mechanics. It's also worth examining the protective case - sometimes it fits too tightly to the buttons, creating constant pressure on the contacts.
- 🔍 Remove the protective case and check if the reboot cycle repeats without it.
- 🔍 Carefully press the power button several times in a row to try to "stir up" the mechanism.
- 🔍 Inspect the body for traces of moisture that could cause the button contacts to short-circuit.
- 🔍 Try tapping your finger lightly on the back cover in the area of the power button (no bigotry) to move possible debris.
If the power button is physically damaged, the software methods are powerless. In some cases, temporarily disabling the button plume (if you have disassembly skills) helps, but for most users, the only solution is to replace the plume at the service center. Ignoring this problem can make the phone impossible to turn off or unlock.
Lack of free memory and overflow of storage
Xiaomi’s modern shells require a significant amount of free space to work properly. When the internal memory is 95-98% full, the system does not have enough space to create temporary files and swap files. This leads to critical kernel errors, and the smartphone goes into reboot, trying to free up resources.
This is especially important for models with a small amount of internal memory (32 or 64 Users often don't realize that the folder DCIM/Camera Or messenger cache like Telegram and WhatsApp can take up tens of gigabytes, and the system simply choked up, unable to write down the necessary logs or update the database index.
☑️ Emergency memory cleanup
To check the fullness, go to Settings. → The phone. → If the scale is red, you need to make room. 500 MB of data can restore stability to the phone. MIUI/debug_log, Sometimes it grows to a huge size due to a logger error.
⚠️ Warning: If the phone is constantly restarting and you can't get on the menu, try booting into Safe Mode. To do this, when the Mi logo appears, press the volume button. In this mode, only system applications are downloaded, which will remove "heavy" debris.
Failures after firmware update or system change
Unstable work is often seen after updating the version of MIUI or HyperOS. New firmware may contain bugs that were not detected in testing on specific hardware configurations. Also, if you previously received Root rights or installed modified versions of the system, an official update can cause version conflict and cyclical reboot.
The situation is aggravated if the update was carried out manually through Recovery, and not in a regular way. Inconsistency of the firmware region (for example, installing a global version on a Chinese device without unlocking the bootloop) is guaranteed to lead to a bootloop.
The solution is to roll back to the previous version or completely reflash it, which requires a computer and the Mi Flash Tool. It is important to understand that switching from one version of Android to another (for example, from Android 11 to 12) without clearing the data (Wipe All Data) can cause errors in data partitions.
What is Fastboot and why is it needed?
If you’ve used custom recavators (like TWRP), make sure they’re updated to the latest version compatible with your Android version.Old versions of the recavéri may not properly mount partitions of the new file system, resulting in the phone instantly turning off when you try to boot.
Hardware malfunctions: battery and plumes
When software is excluded, you have to talk about hardware. The most common hardware reason is battery degradation. Lithium polymer batteries lose capacity over time and, more importantly, can not give the necessary peak current. When the processor requires energy to start a heavy application or communication module, the voltage on the battery drops sharply, and the deep discharge protection goes off — the phone turns off.
Another common problem with Xiaomi smartphones is the waste of plumes. The main plume connecting the motherboard to charging boards and buttons can oxidize or move away from vibration when falling, causing a loss of contact, which the system regards as battery extraction or a critical hardware error.
You can diagnose the battery through the engineering menu, enter the code ##6485## in the Caller app and note the parameters:
| Parameter | Description | Normal value. |
|---|---|---|
| MB_06 | Battery status | Good |
| MB_00 | Percentage of charge | Current value |
| MF_02 | Charging cycles | Less than 500. |
| MF_05 | Real capacity | Close to the face value. |
If the status field says "Bad" or the actual capacity is less than 70% of the nominal, a battery replacement is mandatory. It is also worth checking the charging connector: if it is shattered, the phone may lose contact with the charger and go into reboot when trying to charge.
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A sharp spike in the percentage of charge (for example, from 40% immediately to 10% or shut down at 20%) is a sure sign of the death of the battery, which requires replacement.
Processor overheating and thermal protection
Modern Snapdragon and MediaTek processors used by Xiaomi are equipped with thermal protection. If the core temperature exceeds a critical threshold (usually around 80-90 degrees), the emergency shutdown or reboot mechanism is activated to prevent the physical destruction of the crystal.
Overheating can be caused not only by games or shooting video in 4K. Often the reason lies in the “hang” process, which loads the processor 100% even in the background, it can be a virus miner, an erroneous update to Google Play service or a failed system process android.system.
To combat overheating:
- 🌡️ Remove a tight cover that interferes with heat removal.
- 🌡️ Check the battery usage statistics in the settings to find the parasite app.
- 🌡️ Do not use your phone while charging, especially with Quick Charge or SuperCharge fast charging.
⚠️ Warning: If the phone is hot to the touch even in standby mode (lies on the table and warms), this is a sign of a serious short circuit on the board or failure of the power controller.