WhatsApp for Samsung Galaxy On5 Pro

The On5 Pro shipped on Android 5.1 Lollipop, and WhatsApp has been raising its minimum Android version and dropping support for the oldest releases. The app may still install for now, but on an OS this old it eventually stops getting updates and can lose features or stop connecting. First make sure you are current: open the Play Store, search WhatsApp, and tap Update, and check Settings > Software update for any final firmware. If the Play Store shows WhatsApp as no longer compatible with your device, there is no fix on the phone itself, because WhatsApp will not keep patching unsupported Android versions, and you would need a newer phone. See how others solved this on Reddit

This is almost always Samsung's battery optimization putting the app to sleep in the background. Go to Settings > Apps > WhatsApp > Battery and set it to Unrestricted (on older One UI it may be Settings > Device maintenance > Battery > App power management, then remove WhatsApp from the sleeping and deep-sleeping app lists). Then in Settings > Apps > WhatsApp > Notifications confirm notifications are allowed, and make sure WhatsApp is excluded from any Data saver or Power saving mode. See how others solved this on Reddit

Inconsistent delivery usually means the system is killing WhatsApp's background connection between messages. In Settings > Apps > WhatsApp > Battery choose Unrestricted, and turn off Settings > Connections > Data usage > Data saver (or allow WhatsApp through it). Inside WhatsApp, open Settings > Notifications and confirm alerts are on, then toggle WhatsApp's notification permission off and back on in Android settings to rebuild the notification channels. See how others solved this on Reddit

That grouped summary is Android's notification bundling, which kicks in when WhatsApp's notifications are throttled or set to a lower importance. In Settings > Apps > WhatsApp > Notifications, open the Message notifications channel and set its importance to High or Urgent so each message posts as its own alert. If the grouping persists, clear WhatsApp's cache in Settings > Apps > WhatsApp > Storage > Clear cache and reboot to refresh the notification channels. See how others solved this on Reddit

Audio glitches are often caused by another app holding the microphone or by a stale cache, so close background apps and clear WhatsApp's cache under Settings > Apps > WhatsApp > Storage > Clear cache. Confirm the microphone permission is granted in Settings > Apps > WhatsApp > Permissions > Microphone, and test with Bluetooth disconnected, since the On5 Pro can misroute call audio to a paired device. If voice notes still cut out, update WhatsApp from the Play Store, as audio bugs are frequently fixed in newer releases. See how others solved this on Reddit

A local .crypt14 file can only be restored on the SAME phone number with its matching encryption key, and WhatsApp restores it automatically on a fresh install when the file sits in the WhatsApp > Databases folder (Internal storage > WhatsApp > Databases on older builds, or Android/media/com.whatsapp/WhatsApp > Databases on newer ones). Reinstall WhatsApp from the Play Store, verify the original number, and choose Restore when prompted; without the original key tied to that number, a standalone .crypt14 cannot be opened. Going forward, set up Settings > Chats > Chat backup to Google Drive with the same Google account so future restores work without juggling crypt files. See how others solved this on Reddit