Why Xiaomi Phone Happens [It] – A Complete Discussion of Causes and Solutions

Have you noticed that your Xiaomi smartphone is acting strangely: suddenly discharges in an hour, warms up for no reason, or apps spontaneously close? In this article, we’ll break down 12 of the most common Xiaomi phone issues (including Redmi, POCO Mi, their diagnosis and elimination methods that work even for low-end models like Redmi 9A or flagships of the type Xiaomi 14 Ultra.

It is important to understand: some "glitch" are associated with the features of firmware MIUI (For example, aggressive battery optimization or background activity of system processes, and others signal hardware malfunctions, from a worn-out battery to motherboard problems. We won’t advise “just reboot the phone” – instead, we’ll offer step-by-step diagnostic instructions to help identify the root of the problem.

If your Xiaomi is getting worse after an upgrade, a drop, or a long-term use, this guide will help you figure out what to do next, and for those who like figures and facts, we have a table of symptoms and solutions at the end of the section.

1.Why Xiaomi is fast discharged (even new)

Fast discharge is the most common complaint of Xiaomi owners, and there may be a dozen reasons for this.

• 🔋 Battery wear: after 300-500 Charging cycles battery capacity falls on 20-30%. You can check the wear through the code ##4636## (Menu "Battery Information" or AccuBattery application.
• 📱 Background activity of applications: MIUI aggressively optimises background processes, but some apps (like Facebook or Telegram) bypass these limitations.
• 🔄 Mischarging: Using unoriginal chargers or charging “up to 100%” reduces battery life every time.
• 📡 Weak network signal: In areas with poor coverage, the phone spends up to 30% of the extra energy searching for the network.

The first thing to do is to diagnose battery consumption:

1. Go to Settings → Battery and Performance → Battery Use.
2. See which apps consume the most power (screen norm — 30-40%, for system processes, before 20%).
3. If there is an unknown application (e.g. com.android.XXX) in the top of the flow, it could be a virus or a system bug.

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If the phone is discharged for 2-3 for an hour without active use, check the settings → Special facilities → Battery discharge notifications. Sometimes a bug triggers that causes the system to show an incorrect percentage of charge.

For models POCO F3/F4 Redmi Note 10/11 It's a problem with overheating of the processor when you charge, which speeds up the discharge:

• Turn off Fast Charging in the battery settings.
• Use the original cable (non-original cables often do not support Quick Charge).
• Charge your phone at temperature 10-30°C (in case of overheating above) 40°C battery degrades in 2 faster).

2.The Xiaomi phone is warming up for no reason

Overheating is the second most popular problem after discharge. Normal operating temperature for Xiaomi is up to 40-45°C (can be checked through the appendix) CPU Monitor if the phone is heated higher 50°C without load is a cause for concern.

Main reasons:

For models with a Snapdragon processor 8xx (For example, Xiaomi 12 Pro or POCO F4 GT) It's a very hot heat problem, because of a bad heat paste, and it's a good thing:

• 🛠️ Replacement of thermopaste (in the service center).
• 📉 Limiting productivity through Settings → Additionally. → Performance mode (select "Balanced").
• 🧊 Use of cooling covers (e.g. Black Shark Cooling Backplate).

If the phone is only warmed in certain applications (for example, in the PUBG Mobile or Genshin Impact, try it out:

1. Reduce the graphical settings in the game.
2. Disable background activity of other applications through Settings → Annexes → Application management → Auto-start.
3. Set a limit FPS (For example, through the Game Turbo in the MIUI).

3. Xiaomi brakes and lags: software and hardware reasons

Slowdown can be associated with a lack of RAM (especially relevant for budget models with a high-quality computer). 3-4 GB of RAM), and with storage problems (worn memory) eMMC/UFS).

How to diagnose:

• 📊 Check the RAM loading in Settings → The phone. → Memory. If you're less than 20 percent free, you have to close your background apps.
• 💾 Run a memory speed test using AndroBench. Read speed below 100MB/s indicates wear on the drive.
• 🔍 Check your phone for viruses (Malwarebytes or Dr.Web).

For models with eMMC memory (Redmi) 8/9, POCO M2) post-deceleration 1-2 years of use due to wear and tear of memory cells:

1. Reset your phone to factory settings (helps in 60% of cases).
2. Replace the motherboard (if the phone brakes even after resetting).

Disable animation in Developer Settings

Clear the cache in Settings → Storage

Remove unused applications

Disable auto-run of unnecessary applications

Update MIUI last-minute-->

If the lags only appear in certain scenarios (such as scrolling through Instagram or opening the camera), the problem may be:

• 📸 Camera driver problems (relevant for Xiaomi Mi 11 with green screen bug").
• 🌐 Poor app optimization (for example, Facebook is known for lags on the app) MIUI).
• 🔄 Conflict of versions MIUI and applications (helps reinstall the application).

4.Network problems: why Xiaomi doesn't catch a signal or loses communication

Weak network signal or sudden communication breakdowns are a common problem, especially for phones with support. 5G (Xiaomi 12T, POCO F4 5G). The reasons can be divided into three categories:

1. Software: modem malfunction, incorrect settings APN, conflict SIM-Cards (for dual-SIM models).
2. Hardware: damage to the antenna plume (often after falling), oxidation of contacts SIM-map.
3. External: problems with the operator, poor coverage in your area.

The first thing to do is to diagnose the network:

• 📶 Check the signal level in the engineering menu: enter ##4636## → "Phone information" → "Network. Signal below. -110 dBm is considered bad.
• 🔄 Switch between network modes: Settings → SIM-maps and mobile networks → Type of network (try it out) 4G instead 5G vice versa).
• 📱 Check it out. SIM-card in another phone – if the problem persists, the operator is to blame.

For the Redmi Note 9 Pro and POCO X3 NFC Problem with network loss after update MIUI. Decision:

1. Reset network settings: Settings → System → Settings Reset → Reset settings Wi-Fi, mobile network and Bluetooth.
2. Update the modem firmware (if available for your model).
3. Turn off VoLTE and VoWiFi in the settings SIM-Cards (sometimes in conflict with the operator's network).

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If the phone stopped catching the network after falling or getting moisture, do not try to disassemble it yourself - damage to the antenna plume requires soldering work.

5. Why Xiaomi doesn’t have a camera (black screen, bugs, artifacts)

Camera problems on Xiaomi can manifest in many ways, from a black screen when you open the app to green bars in the photo (a famous bug in Xiaomi Mi 11) or autofocus that doesn’t work.

The most common reasons are:

• 📸 Software failure: the camera application conflict with MIUI (especially after updating).
• 🔧 Damage to the camera plume (often after falling or repairing).
• 🦠 A virus or malware that blocks access to the camera.
• 🔋 Lack of power for the camera module (relevant with a discharged battery).

The first steps to diagnose:

1. Try opening the camera through another app (like Google Camera or Open Camera) if it works, it's a problem in the standard app.
2. Clear the cache and data of the camera app: Settings → Annexes → Camera. → Warehouse → Clear the cache/data.
3. Check if another application blocks access to the camera (such as an antivirus or permissions manager).

If the camera shows a black screen, but other apps (like Snapchat) are working normally, the problem may be:

• 🔧 Damage to the camera firmware (you need to reflash the module in the service).
• 📱 Conflict with shell MIUI (helps reset to factory settings).
• 🔌 No contact of the plume (if the phone fell).

For Xiaomi Mi models 10T and POCO F2 Pro is known for a pink-tinted bug in the photo, which is due to the malfunctioning of the image processing algorithm:

• Turn it off. AI-camera.
• Install Google Camera with the right config for your model.
• Update. MIUI Up to the latest version (bug corrected in the MIUI 13+).

6.Why Xiaomi spontaneously reboots

Spontaneous reboots are one of the most frustrating bugs, as they can indicate serious hardware problems, most often because of:

• 🔋 Faulty battery (swelling, short circuit).
• 📱 Processor overheating (protective shutdown at 80)°C+).
• 💾 Damaged firmware (especially after a failed update).
• 🔌 Power problems (faulty charging controller).

How to diagnose:

1. Check if it reboots when you connect to the charger, and if so, the problem is the power controller.
2. Launch your phone in Safe Mode (hold the power button) → "Safe Mode Restart. If the reboots have stopped, the third-party app is to blame.
3. Check out the reboot logs through ADB: adb shell cat /proc/last_kmsg (If there is a string of thermal engine - the problem is overheating).

For the Redmi Note 8 Pro and POCO X3 We know that we have a problem with rebooting because of the wear and tear of the eMMC, and that's where the motherboard replacement will help.

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If the phone reboots with a characteristic "cotton" or burning smell - turn it off immediately and do not turn it on! This is a sign of a short circuit that can lead to a fire.

7.Sensor issues: why Xiaomi's screen doesn't respond to touch

A broken sensor is a problem that can be either software (30 percent of the time) or hardware (70 percent of the time).

• 📱 The screen responds only to a part of the touch.
• 🔄 The sensor floats (touches are not recorded where you clicked).
• 🚫 The screen does not respond to touch completely.

The first steps to diagnose:

1. Check if the sensor is working in Safe Mode. If so, there's a problem in the app.
2. Connect your phone to your PC and check if touches are recorded in ADB: adb shell getevent -l (If there are no problems, the hardware problem).
3. Check if the battery is swelling (it can press on the sensor plume).

For Xiaomi Mi models A2/A3 (with pure Android) is characterized by a problem with disabling the sensor after the update:

• Reverse to the previous version of the firmware.
• Perform reset to factory settings.
• If it doesn’t work, you need to replace the sensory glass.

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If the sensor stopped working after the phone fell, do not try to "knock on the screen" - this can permanently damage the plume.

FAQ: Answers to Frequent Questions