Introduction: When the “state” becomes a “brick”
The Xiaomi Redmi 9A is one of the most popular budget smartphones on the market, but even it is not immune to performance problems. If your device starts to slow down, “think” when opening applications or even hanging on the MIUI logo, this does not always mean that it is time to buy a new phone. 80% of the time the reasons are rooted in software failures, system overload or incorrect settings – all of which are fixable at home.
This article will help you understand why the Redmi 9A is unstable even if you haven’t dropped it or poured water, and we’ve analyzed user reviews, model specifications, and typical MIUI errors to make a complete diagnostic checklist, from basic checks to deep repairs through Fastboot. And if you’ve tried everything you can, there’s a section at the end of the article about hidden hardware defects that are not reported in service centers.
1.Overheating: Why Redmi 9A 'suffocates' and turns off
The Redmi 9A is powered by a MediaTek Helio G25 processor, which is energy efficient but prone to overheating under intense stress. If the phone freezes and shuts down while playing, shooting videos or charging, the first reason is thermal trottling, which is an automatic reduction in cooling performance, and the normal operating temperature for this model is up to 45°C, but it starts to crash at 50°C+.
How to check:
- 🔥 Install the app AIDA64 (Free on Google Play and check the temperature in the Sensors section.
- 📉 If the temperature is above 55°C in plain is a critical signal.
- 🔋 Charging. + play = guaranteed overheating.Redmi 9A Not intended for multitasking!
Decisions:
- 🧊 Remove the case (especially silicone) – it blocks heat transfer.
- 🔌 Do not use your phone while charging for resource-intensive tasks.
- 🛠️ If overheating is constant - replace the thermopaste (in the service it is worth it). ~500₽).
⚠️ Warning: If your phone turns off at 30-40% charge and is warming, it's a sign of battery bloating!
Lack of RAM: why MIUI is "squeezing" applications
The Redmi 9A has only 2GB of RAM (Redmi 9A Sport has 3GB), which is extremely low for modern applications, especially if you:
- 📱 Keep 10 open.+ chrome.
- 🎮 Play in. PUBG Mobile or Genshin Impact (they require a minimum of 3GB of RAM).
- 📸 Use the camera in 4K video-model.
MIUI aggressively kills background processes to free up memory, but sometimes it leads to freezes, for example, if you listen to music on Spotify and open Instagram at the same time, the phone can hang for 5-10 seconds.
How to clean RAM without root:
- Open the settings → Applications → Launched.
- Click Clear Everything (but this is a temporary solution).
- Install Lite versions of apps (e.g. Facebook Lite, Messenger Lite).
- Turn off animation: go to Settings → About Phone → MIUI version (click 7 times to turn on Developer Mode), then to Settings → Additional → For developers, set Windows Animation = 0.5x.
☑️ Optimizing memory on Redmi 9A
3.Clogged storage: why 32GB is not enough
The Redmi 9A as a basic configuration has 32 GB of memory, of which up to 10 GB takes MIUI out of the box. If it is free less than 3-5 GB, the system begins to slow down, as it can not create temporary files for the application to work.
How to make room:
- 📁 Remove the cache: Settings → Warehouse → Clear cache (can release up to 1-3 GB).
- 🎵 Transfer music and photos to a memory card (but not all apps support it!).
- 🗑️ Remove unnecessary APK-file in the Download folder.
- 🔍 Check the folder. DCIM/.thumbnails — There could be gigabytes of miniatures.
Hidden memory eaters:
| Reason. | How much does it take? | How to clean up |
|---|---|---|
| Cash Google Play Services | Up to 2GB | Settings → Applications → Google Play Services → Storage → Clear cache |
| MIUI Logs (/data/log) | Up to 500MB | Only through ADB or reset |
| Remnants of Remote Applications | Up to 1GB | Use SD Maid (requires root) |
⚠️ Warning: If your memory is clogged again after cleaning, check your phone for viruses (for example, through Malwarebytes). /data.
4. MIUI failures: firmware bugs and how to fix them
MIUI is a customized shell of Android, and it is not without bugs. Redmi 9A users often encounter:
- 🔄 Cyclical reboot (phone turned on, shows logo) MIUI and off).
- 📵 Hanging on the lock screen (does not respond to touches).
- 🔊 Distortion of sound during getting stuck (wheezing in dynamics).
Solutions:
- Reset settings: Settings → About phone → Reset settings (save data!).
- Cache section cleaning: 1. Turn off the phone. 2. Press Power + Volume up until the Fastboot logo appears. 3. Select Recovery → Wipe Cache Partition.
- Update: Settings → System Update. If the update does not come, download the full firmware package from the official Xiaomi website and install through Recovery.
If the phone doesn’t turn on at all, try flashing it through Fastboot:
Instructions for firmware through Fastboot
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If the phone still freezes after firmware, the problem is in the hardware (see Section 6).
5. App conflicts: who is to blame for the brakes?
Some apps are not optimized for the MediaTek Helio G25 and cause crashes, most often to blame:
- 🎮 High Demand Games (Call of Duty Mobile, Free Fire).
- 📷 Video processing applications (CapCut, KineMaster).
- 🔒 Antiviruses (like Avast or 360 Security) – they load the processor with background checks).
- 📡 VPN-Customers (especially free ones like Turbo) VPN).
How to find the culprit:
- Go to Settings → Battery → Battery Use.
- See which apps consume >10% charge in a short time.
- Remove or replace them with analogs (for example, instead of Chrome, use Brave or Firefox Lite).
If your phone freezes when you open a particular app, try:
- Clear its cache (Settings → Apps → [name] → Storage → Clear the cache).
- Turn off notifications for him.
- Install an older version of APK (e.g. with APKCombo).
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If Redmi 9A is slowing down on WhatsApp or Telegram, turn off autoload media in the chat settings. This will save both memory and battery power.
6. Hardware problems: when it is time to carry to the service
If all the software methods have been tried, and the Redmi 9A still freezes, restarts or shuts down, it's the hardware.
| Symptoms. | Probable cause | Cost of repair (2026) |
|---|---|---|
| The phone turns off at 20-50% charge | Battery swelling/wear | 800–1 500₽ (replacement) |
| Freezes when connecting to Wi-Fi/4G | Problems with the antenna module | 1 200–2 500₽ |
| Artifacts on the screen + brakes | Detachment of the display plume or graphics chip | 1 500–3 000₽ |
| Overheating without load (60°C+) | Failure of the processor or thermopaste | 1 000–4 000₽ |
How to diagnose:
- 🔋 If the phone does not hold a charge (discharges in 2-3 hours) – check the battery through AccuBattery.
- 📶 If it freezes when calling - a problem in the communication module (possibly oxidation of contacts after moisture).
- 🖥️ If the screen flashes and brakes, test on another display (in the service).
⚠️ Attention: If Redmi 9A does not turn on after a fall, do not try to disassemble it yourself - in this model, a fragile motherboard, and with careless handling, you can damage the tracks.
7. Alternative solutions: from custom firmware to upgrade
If you’ve exhausted all options, but your phone is still slowing down, consider:
- 🔄 Install custom firmware (like LineageOS or Pixel Experience) that will remove MIUI It may speed up your work, but it will take away your guarantee.
- 🔋 Replacement of the battery with a new one (original Xiaomi or a quality analogue from Green Cell).
- 📱 Buy used Redmi Note 10 – it is equipped with 4 GB of RAM and Snapdragon 678, which is 2-3 times more productive.
Warning for custom firmware:
- ❌ Do not install firmware for other models (for example, for Redmi). 9C) — It'll kill the phone.
- ❌ Before the firmware, make a backup through TWRP (But installing it also requires unlocking the bootloader).
- ❌ Castom firmware can break a camera or module NFC (if there is).
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Custom firmware gives you 30 to 50 percent performance gains, but it requires technical skills, and for beginners, it's better to just reset to factory settings.