WhatsApp for Realme

Realme UI (ColorOS) aggressively kills background apps to save battery, which is the usual cause. Go to Settings > Apps > App management > WhatsApp > Battery usage and set it to "Allow background activity" (or "Don't optimize"), then open Recents, swipe down on the WhatsApp card (or long-press it) and tap the lock icon so the app isn't cleared from memory. Also confirm notifications are enabled under Settings > Notification & status bar > Manage notifications > WhatsApp. See how others solved this on Reddit

On realme UI 6 the most common cause of WhatsApp battery drain is the app being woken constantly by sync and background activity. Go to Settings > Battery > Power usage (or Settings > Apps > App management > WhatsApp > Battery usage) and check whether WhatsApp shows high background drain. Set WhatsApp's background activity to a controlled mode rather than fully Unrestricted: Settings > Apps > App management > WhatsApp > and turn on 'Allow background activity' but leave 'Allow auto-launch' enabled only if you need instant notifications. Also open Settings > Battery and turn OFF 'High background power consumption' alerts only after you've confirmed the drain. If drain persists, clear WhatsApp's cache (WhatsApp > Settings > Storage and data > Manage storage) and reboot, since a stuck media sync is a frequent cause. See how others solved this on Reddit

Crashes are usually caused by a corrupted app cache or an outdated version. First open the Play Store, search for WhatsApp and tap Update if available. Then go to Settings > Apps > App management > WhatsApp > Storage usage and tap Clear cache (avoid Clear data, which would wipe local chat data). If it still crashes, update Realme UI under Settings > About device > Software update, since an outdated Android System WebView or system component can take the app down with it. As a last resort, also update Android System WebView from the Play Store. See how others solved this on Reddit

Crashes are usually caused by a corrupted cache or an outdated app version. Open Settings > Apps > App management > WhatsApp > Storage usage and tap Clear cache (not Clear data, which would wipe your local setup), then update WhatsApp from the Google Play Store. If it still crashes, back up your chats in WhatsApp > Settings > Chats > Chat backup, then uninstall and reinstall the app. See how others solved this on Reddit

Realme UI's aggressive battery saver freezes background apps, so messages only arrive when you open WhatsApp. Go to Settings > Apps > App management > WhatsApp > Battery usage and set it to "Allow background activity" (don't optimize), then open Recent apps, swipe down on the WhatsApp card and tap the lock icon so it isn't auto-cleared. See how others solved this on Reddit

Realme UI's aggressive battery management freezes WhatsApp in the background, so messages only arrive when you open the app. Go to Settings > Apps > App management > WhatsApp > Battery usage and enable "Allow background activity" and "Allow auto launch." Then open Settings > Battery and turn off "Sleep standby optimization." Finally, open Recent apps, long-press the WhatsApp card, and tap the lock icon so the system stops clearing it from memory. See how others solved this on Reddit

ColorOS aggressively kills background apps to save battery, which stops WhatsApp from delivering notifications. First open Settings > Apps > App management > WhatsApp > Notifications and make sure Allow notifications is on. Then go to Settings > Battery > App battery usage > WhatsApp (or App management > WhatsApp > Battery usage) and enable Allow background activity and Allow auto-launch. Finally open the Recent apps screen, hold or tap the menu on the WhatsApp card and choose Lock so the system can't clear it from memory. See how others solved this on Reddit

That extra code is usually WhatsApp's two-step verification PIN, not your phone's lock code. On the PIN screen tap Forgot PIN and use the email address you linked to WhatsApp to reset it. If you never added an email, WhatsApp makes you wait out a 7-day timer before it lets you back in without the PIN, after which your account and chats stay intact. To stop it happening again, open WhatsApp Settings > Account > Two-step verification and add a recovery email. See how others solved this on Reddit

Poor video call quality usually comes from a weak or fluctuating connection or WhatsApp's data-saving limit, so first test on a stable Wi-Fi network and in WhatsApp open Settings > Storage and data and turn off 'Use less data for calls.' On the Realme C67, also go to Settings > Apps > App management > WhatsApp > Data usage and allow both mobile and Wi-Fi background data, since ColorOS data-saver restrictions can throttle the live video stream. Updating WhatsApp from the Play Store also helps, as older builds had call-quality bugs. See how others solved this on Reddit

realme UI 6's aggressive battery manager throttles WhatsApp in the background, which forces it to re-sync and consume more power when you reopen it. Go to Settings > Apps > App management > WhatsApp > Power saver (or Battery usage) and set it to "Allow background activity" / "Don't optimize." Then lock WhatsApp in the Recent Apps screen (open the recents view, swipe down on the WhatsApp card or tap the menu, and choose Lock) so the system stops killing it. Keeping the app from being force-stopped is what reduces the wake-and-resync battery drain. See how others solved this on Reddit