WhatsApp for Samsung Galaxy Z Fold 2

This is usually Samsung's battery management suspending WhatsApp in the background. Open Settings > Apps > WhatsApp > Battery and set it to Unrestricted. Then go to Settings > Apps > WhatsApp > Notifications and confirm Allow notifications is on. Finally open WhatsApp, tap the three dots > Settings > Notifications and make sure message notifications are enabled. Also check Settings > Battery > Background usage limits and remove WhatsApp from Sleeping apps so it stays connected. See how others solved this on Reddit

When too many WhatsApp alerts arrive, the system collapses them into a single summary, hiding the individual sender and preview. Long-press a WhatsApp notification and tap the gear or Settings to open its notification settings, then make sure each notification category is set to alert rather than silent. In WhatsApp itself, tap three dots > Settings > Notifications and confirm message notifications and the high-priority popup are on. If the grouping persists, clearing WhatsApp's cache via Settings > Apps > WhatsApp > Storage > Clear cache can help the channels rebuild. See how others solved this on Reddit

WhatsApp doesn't always redraw cleanly when switching between the cover and main screen, causing freezes or blank screens. Make sure the app is updated from the Play Store, then clear its cache via Settings > Apps > WhatsApp > Storage > Clear cache. To keep it running across the fold, open Settings > Display and enable the cover-screen / continue-apps option for WhatsApp if your One UI version offers it (some models require the Good Lock Cover Screen module). A restart after updating usually clears the redraw issue. See how others solved this on Reddit

Samsung's aggressive memory and battery management puts background apps to sleep more eagerly than stock Android, which delays WhatsApp delivery. Open Settings > Battery > Background usage limits and remove WhatsApp from Sleeping apps and Deep sleeping apps, then add it to Never sleeping apps. Also turn off Put unused apps to sleep, and set WhatsApp's battery usage to Unrestricted under Settings > Apps > WhatsApp > Battery so it stays connected for real-time delivery. See how others solved this on Reddit

WhatsApp can keep alerting if it's listed as an allowed exception in Do Not Disturb. Go to Settings > Notifications > Do not disturb > Apps and remove WhatsApp so it's no longer allowed through. Then check the Calls and Messages exceptions in the same Do not disturb menu, since WhatsApp calls can ring even when chats are silenced. Note that muting individual chats inside WhatsApp still controls those threads separately. See how others solved this on Reddit

Samsung's cover-screen panel sometimes won't expand third-party notifications unless content display is fully enabled. Go to Settings > Notifications > Lock screen / Cover screen notifications and set it to show content rather than icons only. Also confirm WhatsApp notifications are enabled under Settings > Apps > WhatsApp > Notifications. If a single message still won't expand, toggling WhatsApp's notifications off and back on resets the layout, and updating WhatsApp from the Play Store often restores inline reply. See how others solved this on Reddit