WhatsApp for Xiaomi Redmi Note 5A Prime (Redmi Y1)

Random reboots on this phone are usually caused by a misbehaving app or corrupted cache after a MIUI update, an unstable custom theme, or a swelling/aging battery. First boot into Safe Mode (hold Power, then long-press the 'Power off' option until 'Safe mode' appears) to check whether a third-party app is the trigger; if reboots stop in Safe Mode, uninstall recently added apps. Clear individual app caches under Settings > Apps > Manage apps > (app) > Clear data > Clear cache, or wipe the system cache from Recovery (power off, then hold Volume Up + Power). If it persists, back up your data and do a factory reset under Settings > Additional settings > Backup & reset > Factory reset. Note this model uses a Snapdragon 435, and an aging battery is a common hardware cause, so a battery replacement may be needed if resets continue. See how others solved this on Reddit

MIUI on the Redmi Note 5A Prime ships with apps like Mi Browser, GetApps, and Mi Video that you can mostly uninstall or disable. Long-press an app icon and tap Uninstall, or go to Settings > Apps > Manage apps, tap the app and choose Uninstall (or Disable for system apps that can't be removed). To cut system ads in apps you can't remove, open that app's settings and turn off 'Receive recommendations', and disable the ad service under Settings > Passwords & security > Authorization & revocation > msa (turn it off). See how others solved this on Reddit

With only 3GB of RAM, this phone bogs down as apps and MIUI bloat grow. Free up resources by going to Settings > Apps > Manage apps and uninstalling or disabling apps you don't use, and stop background apps from auto-launching under Settings > Apps > Permissions > Autostart. Clear junk via Settings > Storage and the built-in Cleaner, and keep some internal storage free. To make the UI feel snappier, enable Developer options (Settings > About phone > tap 'MIUI version' 7 times), then set Window/Transition/Animator scales to 0.5x under Settings > Additional settings > Developer options. See how others solved this on Reddit

After years of use the 3080mAh battery degrades and background apps make drain and heat worse. Open Settings > Battery & performance > Battery usage to find the heaviest apps, then restrict their background activity and disable their auto-launch under Settings > Apps > Permissions > Autostart. Turn on Battery saver, lower screen brightness and screen timeout, and remove apps you rarely use. If the phone still heats up and drains within a few hours, the aging battery likely needs replacement at a service center. See how others solved this on Reddit

The Redmi Y1 is well past its MIUI update support, so it stays usable mainly for calls, messaging and light apps rather than demanding modern apps. Keep it lean: only install apps you actually need, offload photos to Google Photos or an SD card to free internal storage, and periodically factory reset via Settings > Additional settings > Backup & reset after backing up to Google Drive. Avoid loading many large apps at once, since the Snapdragon 435 and 3GB of RAM struggle with current software. See how others solved this on Reddit