WhatsApp for Samsung Galaxy Note 7

On Samsung phones running older Android builds, WhatsApp can become unstable when app updates outpace the OS. Clear the cache via Settings > Apps > WhatsApp > Storage > Clear cache (do not clear data, as that can remove unbacked-up chats). Then update both WhatsApp and Android System WebView from the Play Store, since an outdated WebView is a common crash trigger on One UI devices. If it still crashes, reboot the phone and reinstall WhatsApp after confirming you have a recent chat backup. See how others solved this on Reddit

This happens when the watch keeps its own copy of an alert after your phone clears it. On the Note 7, open the Galaxy Wearable app, go to Watch settings > Notifications, and turn off 'Show notifications while using phone' so alerts only mirror when the screen is off. Make sure 'Sync notifications' is enabled so dismissing a chat on the phone also clears it on the watch. Restarting both devices after changing this forces the sync to take effect. See how others solved this on Reddit

Most Galaxy watches mirror WhatsApp notifications from the phone rather than running a full WhatsApp client, so what you can do depends on the watch model. On the Note 7, confirm WhatsApp is enabled under Galaxy Wearable > Notifications > app list, then use the watch's built-in reply or voice-to-text option on the notification itself. Voice-note playback is generally not supported on the watch — you'll need to open the chat on the phone to hear it. See how others solved this on Reddit

Broken or non-displaying media usually comes from an interrupted download or a stale media cache. On the Note 7, clear the cache via Settings > Apps > WhatsApp > Storage > Clear cache (not data). Then in WhatsApp open Settings > Storage and data, check your media auto-download options, and tap the broken image again to force a fresh download. Also confirm the phone has free storage, since a full device can silently fail to write incoming media. See how others solved this on Reddit

Random shutdowns on aging Note-series hardware are often caused by a failing or swollen battery, or a misbehaving app holding a wake-lock. Back up your chats first via WhatsApp > Settings > Chats > Chat backup > Back up to Google Drive. Then boot into Safe Mode (press and hold Power, then long-press 'Power off' until the Safe Mode prompt appears) to test whether a third-party app is the cause. Check Settings > Battery and device care for any battery warning. If the shutdowns continue, the battery most likely needs replacing. See how others solved this on Reddit