WhatsApp for OnePlus 8 Pro

OxygenOS aggressively kills background apps to save battery, which delays or blocks WhatsApp alerts. Go to Settings > Apps > App management > WhatsApp > Battery usage and set it to "Don't restrict" (or "Allow background activity"), then open Settings > Battery > More settings and disable "Sleep standby optimization." Also lock WhatsApp in the recent apps overview by tapping the menu on its card and selecting Lock so the system stops clearing it from memory. See how others solved this on Reddit

After a major OxygenOS/Android version jump, the old WhatsApp build can misbehave until permissions and caches are refreshed. Update WhatsApp to the latest version from the Play Store, then go to Settings > Apps > App management > WhatsApp > Storage usage and tap Clear cache (not Clear data, which would wipe local chats). If problems persist, confirm all permissions are granted under WhatsApp > Permissions and that battery optimization is set to "Don't restrict" for it. See how others solved this on Reddit

OxygenOS hides message content on the lock screen by default for privacy. Go to Settings > Notifications & status bar > Manage notifications > WhatsApp and enable lock-screen notifications, then set the content style to "Show content" instead of "Hide content." Make sure WhatsApp's own in-app setting under WhatsApp > Settings > Notifications has notifications turned on as well. See how others solved this on Reddit

This is usually a Bluetooth audio-profile handshake issue between WhatsApp and the headset rather than a hardware fault. First make sure the headset is connected before starting the call. If audio still comes through the phone, go to Settings > Bluetooth, forget the device and pair it again to reset the call-audio profile. Clearing the WhatsApp cache under Settings > Apps > App management > WhatsApp > Storage usage often restores correct routing too. See how others solved this on Reddit

Excessive heat usually comes from WhatsApp constantly syncing or holding a wake-lock in the background. Turn off auto-download of media under WhatsApp > Settings > Storage and data > Media auto-download, then set WhatsApp's battery usage to "Optimized" (or "Don't restrict" if you also need notifications) under Settings > Apps > App management > WhatsApp > Battery usage. If it still runs hot, clear the WhatsApp cache under Storage usage and check Settings > Battery for any rogue background activity attributed to it. See how others solved this on Reddit

WhatsApp uses its own basic in-app camera that doesn't always match the device's full sensor framing, causing a cropped or off-center preview. The reliable workaround is to skip the in-app camera: tap the attachment/gallery icon and use the stock OnePlus camera or your gallery to capture and send the photo. Updating WhatsApp to the latest Play Store version also resolves many alignment glitches once they are patched. See how others solved this on Reddit