Xiaomi phone turns off at night by itself: the reasons and how to fix

You wake up in the morning and your Xiaomi is completely drained or even shut down in the middle of the night — despite the fact that you put it on charge in the evening? — This problem is familiar to many owners of smartphones of the brand, and it is not always associated with the “dying” battery. 80% of cases are to blame software failures, improper settings of power saving or conflicting applications that actively consume resources in the background.

In this article, we’ll look at all the possible reasons Xiaomi (including Redmi, POCO, and Mi models) can shut down at night, from overheating to hidden firmware errors, how to diagnose a problem without going to the service center, what settings to check first, and what to do if the phone turns off even when it’s 100% charged, and at the end, you’ll find a step-by-step instruction to restore the device to stable operation.

1.Battery problems: when the battery is 100% to blame

If your Xiaomi is older than 2-3 years, the first thought of a spontaneous shutdown is battery wear. Over time, battery capacity decreases, and even at 30-40% readings, the phone can suddenly pass out. But how do you distinguish a "dead" battery from other causes?

Pay attention to these symptoms:

• 🔋 The phone shuts down at 20-50% charge, although previously worked up to 5-10%.
• 🔥 The body is noticeably heated during charging or use.
• ⚡ Charging jumps: 80%, then 15% in a few minutes.
• 🕒 Autonomous life has decreased by 2-3 times compared to the new device.

To check the battery status, go to Settings → Battery Status (on MIUI 14+) or use the AccuBattery app (available on Google Play). If the capacity has dropped below 70-75% of the original, the battery needs to be replaced. On Xiaomi models with a non-removable battery (for example, Redmi Note 10 Pro or Mi 11), self-replacement is fraught with damage to the plumes, you better contact the service.

⚠️ Warning: If the phone turns off when connected to charging, this may indicate a power controller malfunction - not to be confused with battery wear.

2. Energy saving modes: why MIUI is "killing" the phone

MIUI is known for aggressive power optimization, which sometimes works too zealously. If your phone shuts down at night, check these settings:

1. Ultra-economic mode (Settings → Battery → Battery Modes) It can force the device to turn off when a certain charge threshold is reached (for example, 15%).
2. Deep application optimization: Some programs (messenger, sleep trackers) may conflict with the system and cause an emergency shutdown.
3. Automatic shutdown with long-term downtime (configured in Settings → Screen → Sleep mode).

To disable unnecessary restrictions:

1. Go to Settings → Battery → Battery settings.
2. Select Battery Optimization and turn it off for critical applications (e.g. WhatsApp, Telegram, Google Play Services).
3. In the Battery Modes section, set Balanced or Performance.

If the problem persists, try resetting the battery settings:

Settings → Applications → Application Management → Three Points (Menu) → Resetting App Settings

3. Conflicting apps: Who 'steals' energy at night

Many users are unaware that some apps can block sleep or cause overheating, causing the phone to shut down.

• 📱 Social networks (Facebook, TikTok, Instagram) – they actively synchronize data in the background.
• 🎮 Games with background processes (e.g. Genshin Impact or PUBG Mobile).
• 🔍 Cleaners and Cleaners (Clean Master, Avast) – they scan the system on schedule.
• 📊 Monitoring applications (CPU Monitor, Battery Guru).

How to find the "culprit":

1. Go to Settings → Battery → Battery Use.
2. See which apps were last using power before shutting down.
3. If you see a suspicious app (e.g., it ate 30% of its charge overnight), limit its activity by:

Settings → Applications → Select application → Battery → Limit background activity

⚠️ Note: Some Xiaomi system applications (such as Mi Security or Mi Cloud) can also cause crashes.

4.Overheating: Why the phone turns off from high heat

Xiaomi automatically shuts down when it overheats (usually above 50–55°C) to prevent component damage.

• 🔥 Charging (especially if you use a non-original adapter).
• 📶 Bad network signal – the phone spends a lot of energy searching for a connection.
• 🖥️ Background processes (updates, backups).
• 🌡️ External conditions (the phone lies under the pillow, next to the heating battery).

How to check the temperature:

1. Install the AIDA64 or CPU Monitor app.
2. See the temperature of the processor and battery in the Sensors section.
3. If the temperature is above 45 ° C in plain – this is an anomaly.

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If the phone is warming up even without charging, check if hidden mining programs are running, install an antivirus (such as Malwarebytes) and scan the system.

5. Firmware failures and MIUI errors

Sometimes the phone will shut down due to critical firmware errors, especially if:

• 📲 You've recently updated. MIUI before.
• 🔄 The device was unlocked (installed custom recavery or root).
• 🛠️ Reset to factory settings with errors.

How to diagnose the problem:

1. Check out the MIUI version in Settings → About Phone. If this is a beta, roll back to stable.
2. Launch your phone in Safe Mode (hold the power button → “Reboot Safe Mode”). If the shutdowns stop, it’s third-party software that’s to blame.
3. See the error logs using the MatLog application (developer rights required).

If the crashes started after the update, try:

Settings → About Phone → System Update → Three Points (Menu) → Select an Service Pack

Download the full firmware package for your model from en.miui.com and install it manually.

6. Hardware malfunctions: when without repairs can not do

If all the software methods have been tried and the phone still shuts down at night, the problem may be in the hardware.

• 🔌 Faulty power controller (phone does not hold charge or turns off when charging is connected).
• 🔋 Bloated battery (sees from the deformed back cover).
• 📱 Problems with the motherboard (most often after falls or moisture hits).
• 🔌 Oxidized contacts of the battery or charging port.

How to check:

1. Light a flashlight into the charging port – if green or white oxides are visible, cleaning is required.
2. Try charging your phone from a different adapter and cable.
3. If the phone doesn’t turn on at all, try pressing the power button + increasing the volume by 10-15 seconds (forced reboot).

⚠️ Warning: If after falling or getting water, the phone starts to turn off at night, do not try to disassemble it yourself - corrosion may have spread to several components.

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If the phone only turns off when connected to charging, there's a 90% chance of a problem with the power controller or battery.

7 Additional causes: from viruses to magnetic storms

Sometimes the phone shuts down at night due to unobvious factors:

• 🦠 Viruses or spyware (e.g. Trojans, miners).
• 🌍 Geomagnetic storms (impacting electronics).
• ⚡ Power surges in the network (if the phone was connected to charging).
• 📡 Conflict with Bluetooth devices (headphones, fitness bracelets).

What to do:

1. Scan your phone for viruses (Dr.Web or Kaspersky).
2. Turn off Bluetooth and Wi-Fi at night.
3. Use a network filter to protect against voltage surges.

FAQ: Frequent questions about Xiaomi's spontaneous shutdown