WhatsApp for Samsung Galaxy A25

Open the Play Store, tap your profile icon then Manage apps & device, and check whether WhatsApp shows as 'pending' or stuck downloading. Clear the Play Store's own cache via Settings > Apps > Google Play Store > Storage > Clear cache, then restart the phone and try again. If it still fails, make sure there's no time/date mismatch (Settings > General management > Date and time > Automatic). As a last resort, download the official APK from whatsapp.com/android and install it after allowing 'Install unknown apps' for your browser. See how others solved this on Reddit

One UI lets specific apps bypass DND if they were granted an exception. Go to Settings > Notifications > Do not disturb and look under 'App notifications' or 'Apps' to see which apps are allowed to override DND, then remove WhatsApp from that allowed list. WhatsApp itself has no separate 'override DND' switch on Android, so the exception is controlled entirely on the One UI side. Reboot after changing it so the new rule fully takes effect. See how others solved this on Reddit

First update both the app and One UI via Play Store > Manage apps & device and Settings > Software update, since most WhatsApp crashes are fixed in newer builds. If it still crashes, clear the app cache (not data) under Settings > Apps > WhatsApp > Storage > Clear cache, and set the battery option at Settings > Apps > WhatsApp > Battery to Unrestricted. If crashes continue, back up your chats to Google Drive in WhatsApp Settings > Chats > Chat backup before reinstalling. See how others solved this on Reddit

This is almost always Samsung's battery optimization sleeping WhatsApp in the background. Go to Settings > Apps > WhatsApp > Battery and set it to Unrestricted, then open Settings > Battery > Background usage limits and make sure WhatsApp is not in the 'Sleeping' or 'Deep sleeping' apps lists. Also confirm Settings > Apps > WhatsApp > Notifications and the in-app Settings > Notifications both allow call notifications. See how others solved this on Reddit

The photos usually come back because copies still exist in Google Photos' cloud backup or in WhatsApp's own media folder. Open Google Photos, delete them there too, then empty its Trash, since the Gallery app shows backed-up photos. Also delete leftovers from the WhatsApp Images folder using a file manager. To stop new ones from saving, turn off Media auto-download in WhatsApp Settings > Storage and data, and turn off Media visibility in WhatsApp Settings > Chats so future downloads stay out of your Gallery. See how others solved this on Reddit

An initialization hang usually means a corrupted cache or a blocked background process. Clear the cache via Settings > Apps > WhatsApp > Storage > Clear cache, then make sure WhatsApp has Storage and Contacts permissions under Settings > Apps > WhatsApp > Permissions. If it still hangs, set your date and time to automatic in Settings > General management > Date and time, and update WhatsApp from the Play Store before reinstalling as a last step. See how others solved this on Reddit