WhatsApp for Realme GT 6

This is the most common GT 6 complaint and it's caused by ColorOS/Realme UI aggressively killing background apps to save power. Go to Settings > Apps > App management > WhatsApp > Battery usage and select Allow background activity (turn off any background restriction), then under Settings > Battery, make sure battery optimization is not restricting WhatsApp. Finally, lock WhatsApp in the Recents screen by swiping down on its card and tapping the lock icon so ColorOS won't clear it from memory. See how others solved this on Reddit

ColorOS puts WhatsApp into deep sleep, so messages only sync when you manually open it. Go to Settings > Battery, open the three-dot menu, find Sleep standby optimization and turn it OFF, and make sure WhatsApp is not in any deep-sleep or hibernating apps list. Also enable Auto-launch for WhatsApp under Settings > Apps > App management > WhatsApp so it can wake itself to receive pushes. See how others solved this on Reddit

An in-app camera failure after a ColorOS update is usually a stale permission or cache issue rather than hardware. Go to Settings > Apps > App management > WhatsApp > Permissions and confirm Camera and Microphone are set to Allow, then clear WhatsApp's cache via Storage usage (this won't delete your chats). If the in-app camera still fails, update WhatsApp from the Play Store and reboot; as a workaround you can attach photos by opening your phone's main camera through the attachment (paperclip) menu instead. See how others solved this on Reddit

Most GT 6 owners get strong battery life (often 8+ hours of screen-on time), so unusually high drain is typically one misbehaving app rather than the phone itself. Open Settings > Battery and check the usage breakdown to see if WhatsApp or another app is running excessively in the background, then turn off Allow background activity for any heavy offender. Keeping apps updated and disabling rarely-used features like persistent location sharing also helps. See how others solved this on Reddit

Realme has pushed firmware fixes for the notification bug (for example the 701-series update), so first check Settings > About device > Software update and install any pending version. If you're already current, re-add WhatsApp to the unrestricted battery list under Settings > Apps > App management > WhatsApp > Battery usage, since updates sometimes reset these settings. You can also toggle WhatsApp notifications off and back on under Settings > Notifications & status bar > Manage notifications to refresh them. See how others solved this on Reddit