Xiaomi phone turns on and off on its own: what to do

When Xiaomi suddenly goes out and lights up again, it can be taken by surprise, especially when the Mi or Redmi logo is on the screen and the device enters an endless cycle, a phenomenon often referred to as a bootloop by engineers, but the reasons may lie not only in the software failure.

Owners are faced with the fact that the gadget works normally for a minute, and then the screen turns black, sometimes accompanied by a vibration or the sound of the charging connection, it is early to panic, because in 80% of cases the problem is solved at home without going to the service center.

Next, we'll look at the algorithms of what we do, from simple checks to complex firmware manipulations, and you'll learn how to tell a dead battery from a dead plume, and when to sound the alarm.

Diagnostics of hardware buttons and mechanical damage

The first thing to rule out is physical key sticking, and if the switch is pressed (even slightly), the smartphone will perceive this as a command to reset, often the problem lies in the protective case that presses on the end of the case.

Take the case off, and carefully examine the side facet. Press the power button several times, it should have a clear, elastic click. If the button is soft, it fails or doesn't click back, there's a mechanical malfunction, and in this state, the contacts inside close, causing the system to reboot in cycles.

It's also worth checking for moisture. Even if the phone wasn't dropped in the water, high humidity or vapor could oxidize the button contacts. Try gently blowing the key area with compressed air or using an alcohol wipe, pressing the button lightly so that the liquid gets inside the mechanism and washs the dirt.

⚠️ Warning: Do not attempt to disassemble the case if the smartphone is warranty.Any trace of an autopsy will result in a denial of free repairs.

Sometimes the problem comes after a fall, because the impact could have displaced the plume that connects the side button to the motherboard, and in the side-finger scanner models, this plume is especially important because it combines fingerprinting and on.

Problems with battery and power system

The second most common culprit is a worn-out battery. Lithium-ion batteries lose capacity over time and can't deliver the required current under load. When the processor requires power to start the system, the voltage drops dramatically, and the protection that turns off the device goes off.

Note the low charge behavior of the phone, if it turns off at 15-20% and it shows 1-5% after it turns on, the wear of the battery is obvious, and it is also worth checking the cable and the power supply: unstable voltage when charging can cause chaotic reboots.

Check the charging connector. A loose Micro-USB or Type-C port can make bad contact. Move the cable: if you charge it, it goes away, the problem is in the socket. Oxidation of contacts inside the port also leads to voltage surges.

You can use codes or apps to accurately diagnose the battery, but the surest way is to do a visual inspection. Not only does the battery reboot, it's also dangerous to health. If the back of the phone is swollen or the screen is starting to move away from the frame, stop using immediately.

⚠️ Warning: A billowing battery may catch fire or explode when you try to charge.Replace it as soon as possible.

If the phone is more 3-4 And even if it's turned on, the chemistry inside has already degraded, and you don't have to wait for stable work.

Programmatic failures and memory overflow

Often, the Xiaomi phone shuts down on its own due to critical errors in the MIUI or HyperOS operating system. A crowded system partition or driver conflict can lead to a kernel panic, which causes an emergency reboot.

Freeing up space is the first step: If the internal memory is 95-99% full, the system does not have enough space for temporary files and cache, which leads to instability of all services, delete unnecessary videos, photos and heavy applications.

Remember, have you recently installed dubious software? Applications from unverified sources may contain malicious code that conflicts with system processes. Try running your phone in safe mode to eliminate the influence of third-party software.

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To enter Safe Mode, press the off button on the screen, and then keep your finger on the “off” icon for a long time until the corresponding offer appears.

Also, the cause may be broken files after a failed update, if the connection is interrupted during the download process, errors may appear in the system files, in which case resetting settings or flashing will help.

Actions in Recovery and Fastboot mode

If the phone goes into a reboot cycle, you need to get into the recovery menu. Recovery mode allows you to reset data or reinstall the system. To log in, press both the power button and the volume button.

In the menu, you can navigate with volume buttons and choose with a power button. Find Wipe Data, which will delete all files, but often eliminates software conflict.

Fastboot mode is used for deep flashing through the computer, and to enter it, press the power button and the volume button, and the screen will show an image of a hare repairing an android, and from here you can try to restore the official firmware through the Mi Flash Tool utility.

⚠️ Note: Entering Fastboot and flashing may void the warranty if you install modified software.

If in Recovery mode the phone also turns off after a few seconds, it is almost guaranteed to indicate a hardware problem (motherboard or battery), since in this mode the load on the processor is minimal.

Analysis of the causes of cyclical reset

To organize this knowledge, let's look at the underlying symptoms and their probable causes in a table that will help you understand where to dig faster.

As you can see from the table, software errors are easier to solve than physical damage, but if the phone has been hit or contacted with water, software methods may not help.

It's important to pay attention to the temperature of the case. If the phone gets very hot at the top (where the processor is) before it turns off, the thermal protection may be triggered, in which case you need to check the background processes and remove heavy applications.

When professional repairs are needed

There are a number of situations where doing it yourself is useless or even harmful, and if you reset it to the factory settings (Wipe All Data), the problem persists, then it's the hardware.

A common problem with Xiaomi’s budget and mid-range models is the processor or memory dump due to overheating. The lead-free soldering used in modern boards is sensitive to temperature expansions. When heated, contact can disappear, causing a shutdown.

It's also worth talking to the masters if the phone falls into the water. Corrosion can take months, gradually corroding the tracks. Even if the phone works, oxidation can cause a short circuit at any time.

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If the factory reset didn't work, it's a hardware problem, and further firmware attempts can permanently disable the device.

Don't try to heat the board with a hairdryer yourself if you don't have experience. The wrong temperature will lead to BGA contacts detachment or chip combustion.

Prevention and proper operation

To avoid a repeat of the situation, follow simple rules of operation: do not allow a full discharge to zero regularly. Deep discharge damages the chemistry of lithium batteries.

Use original or certified cables and charging units. Cheap counterparts with AliExpress often do not hold the claimed current, leading to voltage surges and unstable operation of the power controller.

Update your system regularly, but only through the official interface. Don't install beta firmware on your main phone unless you're sure of its stability. Betas often contain bugs that cause cyclic reboots.

Keep an eye on the memory. 10-15% Free space for the correct operation of the cache of the system and applications, which will prolong the life of your device and ensure its stable operation.