WhatsApp for Samsung Galaxy J7 Pro

The Galaxy J7 Pro shipped with Android 7.0 Nougat and was later updated to Android 9 Pie, which still meets WhatsApp's current minimum (Android 5.0+), so you are fine for now. WhatsApp periodically raises that floor, so install any pending updates under Settings > Software update and keep WhatsApp current from the Play Store to avoid a sudden cutoff. If your unit is still stuck on Nougat and never received the Pie update, that older version is the real risk factor to watch. See how others solved this on Reddit

WhatsApp ends support for very old Android releases (the Lollipop 5.x era) on a rolling basis, but the J7 Pro runs Nougat or Pie, so it is above that threshold. Confirm your version under Settings > About phone > Software information; if it reads Android 7 or higher you will keep getting WhatsApp updates. If support ever does lapse, your chats stay locked into the last working build, so back them up to Google Drive before moving to a newer device. See how others solved this on Reddit

This is almost always Samsung's battery optimization putting WhatsApp to sleep. Go to Settings > Apps > WhatsApp > Battery and set it to Unrestricted, then under Settings > Device care > Battery remove WhatsApp from any Sleeping or Deep sleeping app list. Also check that Settings > Apps > WhatsApp > Notifications is on and that Do Not Disturb is off, and inside WhatsApp confirm a call ringtone is selected under Settings > Notifications. After that the phone should ring even when the screen is locked. See how others solved this on Reddit

This error appears when you have an unofficial mod (like GBWhatsApp) or an outdated sideloaded APK installed, and the only safe fix is to back up your chats first, then uninstall that version. Install the genuine app fresh from the Google Play Store, open it, and restore your backup from Google Drive when prompted. Avoid third-party WhatsApp clones entirely, as they can get your number banned and are not officially encrypted. See how others solved this on Reddit

WhatsApp media is the usual culprit, so open WhatsApp > Settings > Storage and data > Manage storage and delete large forwarded videos and the 'Larger than 5 MB' items. Then move photos to a microSD card via My Files, clear cache under Settings > Apps > WhatsApp > Storage > Clear cache, and uninstall unused apps. Keeping a few GB free lets the Play Store finish WhatsApp updates that otherwise stall. See how others solved this on Reddit

Even with the genuine app, this can trigger if your J7 Pro's date and time are wrong or the install got corrupted, so first set Settings > General management > Date and time to Automatic. If it persists, clear WhatsApp's cache (not data) under Settings > Apps > WhatsApp > Storage > Clear cache, make sure the app is fully updated in the Play Store, and reboot. As a last resort, back up to Google Drive, reinstall from Play, and restore. See how others solved this on Reddit