The Xiaomi Redmi Note 8 is one of the most popular smartphones in the budget segment, but even it is not immune to technical problems. One of the most annoying malfunctions is spontaneous reboots, when the phone turns off and on for no apparent reason, which not only interferes with work, but can also signal serious problems with hardware or software.
In this article, we will examine all possible reasons why the Redmi Note 8 can reboot on its own – from banal overheating to critical firmware errors. You will learn how to diagnose a problem yourself, which settings to check first, and in which cases you can not do without a visit to the service center. MIUI, which few know.
If your phone has recently started to glitches, don't panic. 80 percent of the time, you can fix it without repair by changing your usage habits slightly or updating your software, but if you reboot every 5 to 10 minutes or have artifacts on your screen, that's a worrying sign that requires immediate action.
1. Processor overheating: the most common cause
Most often, the Redmi Note 8 reboots due to overheating of the Snapdragon 665 chipset, which is prone to trottling (automatic performance reduction) at high temperatures, but in critical cases, the system is forced to urgently restart to avoid damage to components.
How do you know if it is overheating?
- 🔥 The phone gets hot to the touch (especially in the camera area and upper body).
- 🎮 Reboots occur during games, shooting videos in 4K or with prolonged use of the navigator.
- ⚡ Battery discharges faster than usual – overheating increases energy consumption.
To check the temperature, install the application. AIDA64 or CPU Monitor. Normal performance for Snapdragon 665:
| Mode of work | Permissible temperature, °C |
|---|---|
| Simple (screen off) | 30–38 |
| Normal use (social networks, messengers) | 38–45 |
| Games or videos in 1080p | 45–55 |
| Critical Threshold (Risk of Resetting) | 60+ |
If the temperature is above 55°C. Try the following measures:
- 🛡️ Remove the cover – it can block heat transfer.
- 🧊 Use a cooling stand (especially for gaming).
- 🔄 Enable Performance Mode Settings → Battery → Performance mode → «Balanced».
- 🚫 Close the background applications through Settings → Annexes → Launched.
⚠️ Warning: If the phone overheats even in a simple (for example, at night), this may indicate a battery malfunction or a short circuit on the motherboard.
2. firmware failures and MIUI errors
Software bugs are the second most common cause of spontaneous reboots. Xiaomi regularly releases updates for the Redmi Note 8, but sometimes they contain bugs, especially in custom firmware or beta versions. MIUI.
Signs of software problems:
- 🔄 Reboots started immediately after system updates.
- 📱 Phone “hangs” before rebooting (black screen or endless animation) MIUI).
- 🛠️ In error logs (Settings) → The phone. → Version. MIUI → Error log) has crash records system_server orroid.process.media.
How to eliminate:
- Reset the system cache: Turn off the phone. Clutch power. + Volume up until the Mi logo appears. Select Wipe Cache Partition. Confirm and restart.
- Reverse to the stable version MIUI: Download the official firmware from Xiaomi. Fastboot or Recovery.
☑️ Preparation for flashing
If the reboots started after installing a particular app, uninstall it and check the behavior of the phone.
- 🎵 Applications for customization of the interface (launchers, themes).
- 🎮 Game cheats or modified APK.
- 🔒 Antiviruses from third-party developers (e.g. Cheetah Mobile).
How to check the error log without root rights?
3. Battery problems: wear or bloating
The Redmi Note 8 has a 4,000mAh battery, but it gets worse over time, and if the phone reboots at 20 to 40 percent, that's a classic sign of battery wear.
Other symptoms:
- ⚡ The battery is discharged in a few hours, even in standby mode.
- 🔋 The phone turns off when connected to charging (or vice versa, it turns on only from charging).
- 📏 The body of the phone became “convex” – this is a sign of battery bloating (requires immediate replacement!).
How to check the status of the battery:
- Enter the dialer code ##4636##.
- Select Battery Information and see Health Level.
- If the battery is below 80%, it is time to change the battery.
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If the phone doesn’t turn on after it’s gone, hold it on charge for 10-15 minutes, even if nothing is on the screen. Sometimes the battery controller falls asleep and needs time to initialize.
The cost of replacing the battery in the service center Xiaomi — about 1500-2500 rubles (2026).If you decide to change your own, choose only the original battery labeled BM47 or BM48.
⚠️ Attention: Bloated battery can ignite when mechanically exposed. If the body of the phone is deformed, do not try to disassemble it - contact the service immediately!
4 Conflicts with SIM- card or SD- card
Few people know, but incorrectly inserted SIM-A card or a damaged microSD can cause a Redmi Note 8 reboot, which is because the memory controllers and modem are integrated into a single chip and malfunctions cause the system to crash.
Signs of card problems:
- 📶 Reboots occur when calling or sending SMS.
- 💾 The phone can't see. SD-Card or Error: "Damaged Memory Card».
- 🔄 After extraction SIM/SD The phone is stable.
What to do:
- Extract. SIM-card and microSD, then gently wipe the contacts with a wiper (to remove oxidation).
- Try inserting cards into another slot (if there is a second slot for you) SIM).
- Format. SD-map FAT32 via computer (the data will be deleted!).
- Check it out. SIM-card on another phone – if it doesn’t work, contact the operator for a replacement.
If the problem persists, the memory controller on the motherboard may have malfunctioned, in which case only repairs to the service will help.
Hardware malfunctions: from vibration motor to motherboard
If all the software methods have been tried and the Redmi Note 8 continues to reboot, it's the hardware.
| Component | Signs of malfunction | Decision |
|---|---|---|
| vibratory motor | Phone vibrates before rebooting, bug in logs vibrator_service | Replacement of the engine (cheap repair) |
| Dynamician or microphone | Reboots when calling or playing sound | Diagnostics of connectors, replacement of components |
| Battery plume | The phone turns off with a light press on the body | Coiling or replacement |
| South Bridge (power chip) | Reboot when connected to charging, phone does not hold charge | Level repairs BGA (expensive, but perhaps) |
The most dangerous malfunction is chip detachment on the motherboard, which is due to falls, bumps or factory defects.
- 💥 The phone reboots with a light impact or shake.
- 🔧 Artifacts (strips, flickers) appear on the screen before turning off.
- 🔌 The charge is “jumping” (it goes, it stops).
In such cases, the soldering of chips on specialized equipment (for example, a station) is required. BGA). The cost of repairs is from 3000 to 8000 rubles, depending on the complexity.
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If the phone reboots when you press a certain part of the case (for example, near the camera), this almost always indicates mechanical damage to the board or detachment of components.
External factors: charger, moisture, magnetic fields
Sometimes it's not the phone itself, it's the environment, and let's look at three of the most insidious things.
1. Non-original charger
Cheap AliExpress charging or fake Xiaomi can give unstable voltage, which makes the phone forced restart (forced to reboot). 18W — Redmi Note 8 Power Controller is not designed to charge faster than this value.
2. Moisture intrusion
Even if the phone hasn't sunk, condensation or high humidity can cause contacts to corrosion.
- 💧 The phone reboots in wet weather or after leaving a warm room for cold.
- 🔌 Charging is interrupted, connector. USB-C oxidized.
- 📱 A “moisture in the connector” warning appears on the screen (even if it is not there).
3. Effects of magnetic fields
Little-known fact: Strong magnets (such as in mount cases or wireless charging) can knock down the compass and Hall sensor, which in rare cases leads to a reboot.
What to do:
- 🔌 Use only the original Xiaomi RAM (model) MDY-08-EG for 18W).
- 🚿 If your phone is wet, don’t turn it on – put it in rice or silica gel for 24 hours.
- 🧲 Remove magnets and metal objects near your phone.
7. When to contact the service center?
If you’ve tried all the techniques in this article, but the Redmi Note 8 continues to reboot, it’s time to turn to the professionals.
- 🔥 Phone heats up to 60°C and above in plain.
- 💥 Reboots are accompanied by cotton, sparks or the smell of burning.
- 🔧 On the motherboard, darkened or bloated components are visible.
- 📵 The phone does not turn on at all (even after charging).
- 🔋 The battery is swelling (the phone case is inflated»).
The cost of diagnostics in official service centers Xiaomi — about 500-1000 rubles. If the problem is the motherboard, repair can cost 50-70% of the cost of a new phone, so sometimes it is more profitable to consider the option of buying a new device.
Before the service visit:
- Make a backup of your data (via Mi Cloud or computer).
- Write down the phone’s IMEI (on the box or in Settings → About the phone).
- Check if the service has original parts for the Redmi Note 8.
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Official Xiaomi service centers give a warranty for repairs up to 6 months, and informal workshops can use non-original components, which will lead to repeated breakdowns.