WhatsApp for Oppo Find N5

ColorOS aggressively manages background apps, which holds back WhatsApp pushes. Go to Settings > Battery & performance > More settings (or App battery management) and set WhatsApp to 'Allow background activity' / 'Don't optimize'. Then open Settings > Apps > App management > WhatsApp and enable 'Allow auto-launch' so the app can wake on incoming messages. Long-pressing WhatsApp in Recent apps and tapping the lock icon also helps keep it from being suspended. See how others solved this on Reddit

Incoming-call alerts need the lock-screen and full-screen permissions that ColorOS often restricts. In Settings > Apps > App management > WhatsApp > Notifications, make sure the 'Calls' channel is enabled with sound and that lock-screen notifications show content. Then in Settings > Apps > Special app access (or App management > WhatsApp), enable 'Display over other apps'. Finally, lock WhatsApp in Recent apps (open the recents view, hold its card, tap the lock icon) so the system can't kill it before a call arrives. See how others solved this on Reddit

After a reboot ColorOS can re-restrict background activity, so WhatsApp gets suspended until you reopen it. Open Settings > Apps > App management > WhatsApp and turn on 'Allow auto-launch', then go to Settings > Battery & performance and set WhatsApp to 'Don't optimize' / 'Allow background activity'. Locking WhatsApp in Recent apps keeps the connection alive while the phone is idle or locked. See how others solved this on Reddit

ColorOS stacks multiple WhatsApp chats into one grouped notification by default. This grouping is controlled by Android's notification system, and ColorOS does not expose a per-app 'ungroup' toggle, so WhatsApp messages will normally appear as a single stacked entry that expands when tapped. Make sure Settings > Apps > App management > WhatsApp > Notifications is fully enabled (with the 'Messages' channel allowed) so every conversation generates its own alert within the stack. See how others solved this on Reddit

This is the classic ColorOS battery-management symptom: messages queue up and only sync when you launch WhatsApp. In Settings > Battery & performance, set WhatsApp to 'Allow background activity' / 'Don't optimize' and turn off any sleep/standby optimization for it. Then in Settings > Apps > App management > WhatsApp enable 'Allow auto-launch', and add WhatsApp to the locked apps list in Recent apps so the system stops suspending its background connection. See how others solved this on Reddit

When alerts are fully silent, verify the basics first: Settings > Apps > App management > WhatsApp > Notifications must be ON with the 'Messages' channel allowed to make sound, and check WhatsApp's in-app Settings > Notifications for the correct tone. Then confirm Do Not Disturb isn't active in the Control Center / Quick Settings, and that no data-saver or background-data restriction is blocking WhatsApp under Settings > Mobile network > Data usage. As a last step, enable 'Allow auto-launch' and re-open WhatsApp to restore the push connection. See how others solved this on Reddit