Why Xiaomi Redmi 8 is Rebooting and How to Fix It: The Complete Guide

If your Xiaomi Redmi 8 starts spontaneously restarting for no apparent reason, it’s not just an annoying glitch, but a signal of a serious malfunction, a behavior that could indicate problems with firmware, battery, hardware, or even malware. Unlike random freezes, cyclical reboots (when the phone turns on and off) often lead to a complete loss of service of the device.

In this article, we will look at all possible causes, from software failures to physical breakdowns, and give step-by-step instructions for diagnosis and repair. We will focus on the unique features of the Redmi 8, such as battery weaknesses and common errors after MIUI updates. If you are not a specialist, don’t worry: most methods do not require disassembly of the phone.

Before you start repairing, answer the key question: when exactly does the reboot occur?

• 🔋 During charging, it is likely a problem with the battery or charger.
• 🎮 When running games/applications, it is the processor overload or incompatible software that is to blame.
• 📱 For no apparent reason (even in standby mode) – a firmware failure or hardware defect is possible.
• 🔄 Cyclical reboot (not included beyond the logo) is a critical bootloop requiring urgent action.

1. Programmatic causes: MIUI and application failures

In 60 percent of cases, the Redmi 8's spontaneous reboots are caused by software problems, with the most common culprits being:

• 🤖 Update MIUI installed with errors (especially relevant for MIUI 12.5+ versions).
• 📱 Application conflict, for example, after installing modified APK or pirated software.
• 🗑️ Clogged memory (less than 1 GB of free space can cause critical slowdown).
• 🛡️ Antivirus or an "optimizer" that blocks system processes (e.g., Clean Master or 360 Security).

The first thing you need to do is boot in Safe Mode, which will disable all third-party apps and help identify the culprit.

1. Turn off the phone (if it is constantly rebooted, wait for the battery to discharge).
2. Press the Power button and hold until the Redmi logo appears.
3. Once the logo appears, immediately press and hold the Volume button down until the phone boots.
4. In the lower left corner of the screen should appear the inscription Safe Mode.

If the reboots have stopped in safe mode, the problem is in one of the installed applications. Uninstall the suspicious software (start with the last ones installed) and check the phone. If the failures continue, move to the next step.

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In Redmi 8, the safe mode may not work the first time due to the features of the firmware. Try repeating the procedure 2-3 times.

2. Resetting to factory settings: when and how to do

If Safe Mode doesn't work, the next step is hard reset, which will delete all data from the phone but return it to a "clean" state. On Redmi 8, resetting through the settings menu may not work if critical crashes occur — use Recovery mode.

Instructions for resetting via Recovery Mode:

1. Turn off the phone (forced to press Power + Volume up for 10 seconds).
2. Press Power + Volume up and hold until the Mi Recovery menu appears.
3. Use volume buttons to navigate, select Wipe Data (or Clear Data).
4. Confirm the action with Yes and wait for the process to be completed.
5. Restart the phone (Reboot).

After the reset, the phone will turn on as new. Don't restore the data from the backup right away -- check the stability of the work for 1-2 days first. If the reboots stopped, the problem was in the software conflict.

Make sure your phone is at least 50 times charged%|

Save important data (photos, contacts) to your PC or cloud|

Write down the username/password from your Mi Account (required to unlock after reset)|

Disable your Google account (if your phone is linked to FRP)|

Prepare the SIM- card to check the connection after reset

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⚠️ Warning: Redmi 8 may require you to enter your Mi Account password after reset, even if you haven't used it. If you forget your data, reset your password in advance through account.xiaomi.com.

Battery problems: diagnostics and solutions

Xiaomi Redmi 8 is known for its weak battery (5,000 mAh capacity, but with low-quality charge controllers).

• 🔌 Connecting/disabling charging,
• 🪫 Charge level drops below 15-20%
• 🌡️ Overheating (battery swells and presses on motherboard),

90% probability of the battery being to blame.

Do a quick diagnosis:

1. Light the flashlight on the battery (if the phone is collapsible), and the swelling is noticeable by the bulge of the body.
2. Check Settings → Battery → Condition. If the actual capacity is less than 80% of the declared, the battery is worn out.
3. Connect the original charger. If the phone only reboots with non-original cables, the problem is the power controller.

Decisions:

• 🔧 Replacement battery (cost ~1500-2500 ₽ at the service center). Redmi 8 has a removable battery, but you will need to disassemble the phone to replace it.
• ⚡ Battery calibration (helps with controller failures): completely discharge the phone, then charge to 100% without interruption.
• 🔌 Use a different charger (recommended power is 18W, like the original Xiaomi adapter).

⚠️ Warning: If the battery is swelling, don't try to puncture or bend it! This could cause fire. Take the phone to the service center immediately.

4. Hardware malfunctions: what breaks down in Redmi 8

If the software methods didn't work, the problem is the hardware. Redmi 8 has a few weaknesses:

• 📱 Battery plume dumping is a common problem after falls.
• 🔌 Oxidation of contacts on the motherboard (especially after moisture hits).
• 🖥️ Processor malfunction (Snapdragon 439 is sensitive to overheating).
• 📶 Communication module problems (if reboots occur when making calls or using mobile internet).

To diagnose hardware problems:

1. Check the phone for physical damage: cracks, dents, traces of oxidation on the connectors.
2. Listen, there are no extraneous sounds (squeaking, rattling) when shaking - this may indicate the dump of components.
3. Connect your phone to your PC and check logs through ADB (adb logcat will display system errors).

If you're not a specialist, you should contact the service, but you can fix some problems yourself.

• 🛠️ Contact cleaning: gently wipe the battery connector and USB- port with alcohol.
• 🔧 Reconnect plumes: If the phone is collapsible, check the density of the battery plume fit.
• 🌡️ Replace thermopaste (if the phone overheats and turns off when loaded).

5.Bootloop: Phone stuck in reboot cycle

Bootloop is when Redmi 8 is turned on, shows the MI or Redmi logo, and then switches off again.

• 📱 Failed update MIUI (interrupted firmware).
• 🔧 Partition damage /system (e.g., after rooting).
• 💥 Hardware failure (most often an eMMC memory problem).

Ways to exit the bootloop:

1. Hard reset via Recovery (described in section 2).
2. Fastboot: fastboot flash boot.img fastboot flash system.img fastboot reboot (requires an unlocked bootloader and official firmware from Xiaomi website).
3. Replacement of the memory module (if the failure is associated with eMMC, a soldering station will be required).

If the phone doesn't respond to any manipulations (it doesn't go into Recovery or Fastboot), it could indicate a chip failure or a short circuit on the board, in which case you just have to carry the device to the service.

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If the Redmi 8 starts to warm up after the bootloop - immediately disconnect it from charging! This is a sign of a short circuit that can lead to fire.

Prevention: How to Prevent Reboots in the Future

To avoid repeated failures, follow these guidelines:

• 🔋 Use the original charger (or certified Quick Charge 3.0-enabled counterparts).
• 📱 Do not install modified firmware (especially Custom-based ROM) unless you are sure of its stability.
• 🧹 Clean the cache regularly through Settings → Memory → Clear the cache.
• 🛡️ Turn off auto-update apps in Google Play (some updates may conflict with MIUI).
• 🌡️ Avoid overheating: Do not play heavy games when charging, do not leave your phone in direct sunlight.

For Redmi 8, it's especially important to keep a good eye on the battery, and use apps like AccuBattery to monitor wear, and if the capacity has dropped below 70 percent, consider replacing it.

It is also useful to disable unnecessary background processes:

1. Go to Settings → Applications → Autorun.
2. Turn off auto-start for underutilized programs.
3. In Settings → Battery → Power mode, choose Balanced (not Performance).

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

Not all problems can be solved by yourself. Immediately contact the service center if:

• 🔥 The phone overheats even in standby mode (fire risk!).
• 💦 Corrosion marks (moisture intrusion) are visible on or under the screen.
• 🔌 Reboots are accompanied by the smell of burning or smoke.
• 📵 The phone is not computer-defined (even in Fastboot).
• 🔄 Cyclical reboot continues after resetting and flashing.

The cost of repairing Redmi 8 in the service:

When choosing a service, give preference to authorized Xiaomi centers - they use original parts and give a guarantee. Avoid "garage" workshops, especially if the problem is related to the motherboard or firmware.

⚠️ Warning: If the phone is warranty, don't open it yourself! This will void warranty obligations. Contact Xiaomi's official service with a check.

Frequently Asked Questions (FAQ)