Why Xiaomi Redmi suddenly shuts down: a full analysis of the causes and solutions

Your Xiaomi Redmi turns off for no apparent reason — in the middle of a conversation, while charging or even on a full battery? — This problem is familiar to many smartphone owners of the brand, but its causes can be dramatically different: in some cases, it is a worn-out battery, in others, a firmware failure or overheating of the processor. Without proper diagnosis, you risk wasting time on unnecessary actions or even aggravating the breakdown.

In this article, we will examine all possible causes of spontaneous disconnection of Redmi, from banal (discharged battery) to exotic (damage to the motherboard). You will learn how to determine the source of the problem, which settings to check first, and when exactly to carry the phone in the service. 10/11/12, Redmi 9/10 and POCO, where the problem is most often encountered.

1.Discharged or worn-out battery is the most common cause

If Xiaomi Redmi turns off at a charge level of 20-30% (or even 50%), it is the wear of the battery that is to blame. Lithium polymer batteries lose capacity after 300-500 charging cycles, and after 2-3 years of operation they can turn off the phone at the slightest load.

• 🔋 Enter the code ##4636 in the phone application## → Select Battery Information. Health level below 80% is critical.
• 📊 Install the application AccuBattery (Play Market) – it will show the real capacity and discharge rate.
• 🔌 If the phone only turns off when charging, check the cable and adapter: faulty accessories can cause voltage surges.

On Redmi Note 9 Pro and older, there is a frequent power controller defect that causes the phone to show 100% charge, but the battery is empty, in which case only a replacement battery in the service will help.

⚠️ Note: Do not use “fast” third-party charging with higher power 33W For older Redmi models (e.g. Redmi) 5/6). This accelerates battery degradation and can lead to sudden shutdowns.

2. CPU overheating: why the phone turns off when loaded

Xiaomi Redmi can shut down due to thermal trottling, a protective mechanism that knocks out the device at a critical temperature.

• 🎮 During the Games (Genshin Impact, PUBG Mobile, Call of Duty).
• 📷 With long-term video shooting in 4K 60 FPS.
• ☀️ In the heat (air temperature above 30)°C).
• 🔄 After the firmware update (new versions) MIUI They may be poorly optimized for older chipsets).

You can check the temperature through the AIDA64 app (Sensors section).

• Battery: above 45°C.
• Processor: above 70°C (for Snapdragon 6xx/7xx) or 80°C (for MediaTek Helio).

If the phone overheats without loading, there may be problems with the heatpast (dried or applied improperly) or the cooling system (dust in the radiator), in which case only disassembly and cleaning in the service will help.

💡

Before playing, turn off background processes: go to Settings → Applications → Autostart and prevent autostart of unnecessary programs. This will reduce the load on the processor by 15-20%.

3. firmware failures and MIUI errors

Software errors can cause spontaneous reboots (reboots) or a complete shutdown of the phone.

• 🔄 The phone is turned off when connected to Wi-Fi/Bluetooth.
• 📱 The screen goes out and does not turn on until you pull out the battery (on models with a removable battery).
• 🔧 After updating MIUI There were lags and spontaneous shutdowns.

The first thing to do is reset the settings to the factory (without deleting the data):

1. Go to Settings → About the phone → Reset settings.
2. Choose Reset All Settings (not to be confused with Delete All Data!).
3. Confirm the action.

If that doesn't work, try rolling back the firmware to the previous version via Fastboot or Recovery.

Download the official firmware from the Xiaomi website

Install ADB/Fastboot drivers on PC

Connect your phone in Fastboot mode (clip Volume Down + Power)

Backup your data (Settings → Additional → Backup)

-->

For Redmi Note 8/9 models, it is often helpful to use firmware through the Mi Flash Tool with the Clean All option. On POCO F3 and later, it is better to use Fastboot commands:

fastboot flash boot boot.img


fastboot flash system system.img




fastboot reboot

⚠️ Attention: Fastboot firmware erases all data, including photos in internal memory. If the phone doesn't turn on but responds to charging, try extracting data through the device. TWRP Recovery before resetting.

4. Problems with motherboard and contacts

If Xiaomi Redmi shuts down when it is lightly impacted, vibrating, or changing position, it is the fault of:

• 🔌 Oxidized battery contacts (frequent problem after moisture is ingested).
• 📱 Microcracks on the motherboard (due to falls).
• 🔋 Power chip dump (on Redmi models) 7/8 after 2-3 service).

Diagnosis:

1. Try to press the back lid slightly in the battery area, and if the phone turns off, the contact problem is.
2. Connect the charging and move the cable. If the charging stops, the USB-C connector fails.
3. Light a flashlight on the motherboard (with the phone disassembled) Dark spots are a sign of oxidation.

The Redmi Note 9S and POCO X3 NFC often leave the charging chip (marked BQ25601 or SY6974).

• Turn off when charging is connected.
• Do not turn on without a connected cable.
• Show 0% charge immediately after disconnection from the network.

5. Application conflicts and viruses

Some programs can block the core of the system, causing the phone to shut down, and most often, the fault is:

• 🛡️ Antiviruses (e.g. Avast, 360 Security).
• 🎮 Cheats for games (modified) APK).
• 🔄 Memory optimizers (e.g., memory optimizers, DU Speed Booster).
• 📱 Root-access apps (if the phone is rooted).

How to find the culprit:

1. Launch your phone in Safe Mode (clip Power → hold Off → select Safe Mode).
2. If there are no shutdowns in Safe Mode, delete applications one by one, starting with the last ones installed.
3. Check the logs via Logcat (ADB required): adb logcat | grep -i "error\|fatal\|crash"

Redmi with MIUI 12/13 often crashes the service com.miui.analytics, which collects usage data, and it can be disabled via ADB:

adb shell pm disable-user --user 0 com.miui.analytics

💡

If the phone starts to shut down after installing the application, delete it and clear the cache through Settings → Storage → Clear the cache.

6.Problems with charger and cable

Unoriginal or damaged accessories can cause power surges that shut down the phone.

• 🔌 The phone is only turned on when the cable is connected.
• ⚡ The charging icon flashes or disappears.
• 🔋 The battery is charged with jerks (1%, then 10% per minute).

How to check:

1. Try another cable and adapter (preferably the original Xiaomi with Quick Charge support).
2. Check the USB-C connector on your phone – if the contacts are bent or oxidized, you need a replacement.
3. Measure the voltage with a multimeter: the output of the adapter should be 5V/9V (depending on the charging protocol).

On the Redmi Note 11 and later, there is a Reverse Charging bug when the phone turns off when another device is connected via USB-C.

• Turn off the function in Settings → Battery → Reverse charging.
• Update the firmware to the latest version of MIUI.

7 Hardware defects: what to do if nothing helps

If Xiaomi Redmi continues to shut down after all the checks, the problem is probably the hardware.

For accurate diagnosis will require:

• 🔧 Multimeter vertebrating of power chains.
• 🔍 Short-circuit check (SCC) between battery contacts.
• 📡 Test of memory (on models with LPDDR4X chips often fail RAM).

Cost of repair:

• Battery replacement: 1,500–3,000 ₽.
• Power chip soldering: 3,000–6,000 ₽.
• Motherboard repairs: 5,000–15,000 ₽ (model-wise).

⚠️ Attention: On Redmi 10C and POCO M4 Pro is often found defect in eMMC memory, which causes the phone to turn off when you write large files (for example, video). AIDA64 (If the eMMC 5.1 type of memory is higher risk of failure.

FAQ: Frequent questions about the spontaneous shutdown of Xiaomi Redmi