WhatsApp for OnePlus 5

This usually happens after an Android System WebView or WhatsApp update that didn't install cleanly. Open the Play Store, search for Android System WebView and tap Update, then do the same for WhatsApp. If the blank screen remains, go to Settings > Apps > WhatsApp > Storage and tap Clear cache (not Clear data, which deletes your local chats). Restart the phone after both updates to restore the normal interface. See how others solved this on Reddit

OxygenOS aggressively closes background apps to save battery, which drops WhatsApp's connection. Go to Settings > Battery > Battery optimization, find WhatsApp and set it to Don't optimize. Then open Settings > Apps > WhatsApp > Battery and enable Allow background activity (on older OxygenOS, also enable Auto-launch under Settings > Apps > App management). Finally, open the Recent Apps screen, tap WhatsApp's icon and choose Lock so the system stops clearing it from memory. See how others solved this on Reddit

OxygenOS won't show the full-screen call interface unless WhatsApp can draw over the screen. Go to Settings > Apps > Special app access > Display over other apps and allow it for WhatsApp. Then open Settings > Apps > WhatsApp > Notifications and make sure the Calls notification category is on with sound and pop-on-screen enabled. Also confirm WhatsApp is exempt from battery optimization so the call connection isn't killed in the background. See how others solved this on Reddit

Built-up cache and a stale connection are the usual cause on older OxygenOS builds. Clear the app cache via Settings > Apps > WhatsApp > Storage > Clear cache, confirm WhatsApp is updated in the Play Store, and make sure it's exempt from battery optimization so it isn't throttled in the background. If chats still won't sync, toggle Airplane mode off and on, or switch between Wi-Fi and mobile data to force a fresh reconnect. See how others solved this on Reddit

Game Space on OxygenOS only mutes notifications when it's configured to. Open Settings > Game Space (or Utilities > Game Space), open its notification settings and choose Block notifications or Text-only so banners and sounds are suppressed during play. For a stronger block, enable Do Not Disturb before launching a game, which silences WhatsApp entirely unless you've added specific contacts as exceptions. See how others solved this on Reddit

This usually means SMS or phone permissions are blocked, so the verification code can't be read. Go to Settings > Apps > WhatsApp > Permissions and enable SMS and Phone, then make sure WhatsApp can run in the background and isn't being killed by battery optimization. If the code still doesn't arrive automatically, tap Resend SMS and type it in manually, or reinstall the latest WhatsApp from the Play Store before re-registering. See how others solved this on Reddit