WhatsApp for Motorola Moto G64

WhatsApp's background activity plus aggressive sync is a common culprit, so open Settings > Apps > WhatsApp > Battery and set it to Unrestricted so it works normally, then disable Settings > Battery > Battery Saver if you had it forcing apps to sleep. Also turn off WhatsApp auto-download of media under WhatsApp > Settings > Storage and data, since constant photo/video downloads keep the radio and screen awake. Finally, check Settings > Battery > Battery usage to confirm WhatsApp isn't being woken unusually often by a stuck chat backup. See how others solved this on Reddit

First grant full mic access at Settings > Apps > WhatsApp > Permissions > Microphone (set to Allow), then clean the bottom microphone hole near the USB-C port since lint or a thick case often muffles it. Update WhatsApp from the Play Store, and during a call avoid covering the bottom edge of the phone with your hand. If it persists, test the mic in a normal phone call or voice recorder to confirm whether it's WhatsApp-specific or a hardware issue. See how others solved this on Reddit

Go to Settings > Apps > WhatsApp > Battery and choose Unrestricted, because Motorola's battery optimization silently kills WhatsApp's background connection and delays alerts. Then confirm Settings > Apps > WhatsApp > Notifications is on and that WhatsApp > Settings > Notifications has both message and group notifications enabled. Also disable any Adaptive Battery or aggressive cleaner setting under Settings > Battery so the app isn't put to sleep. See how others solved this on Reddit

This happens when the phone drops to a 2G/3G connection during calls because VoLTE isn't active, so enable Settings > Network and internet > SIMs > [your SIM] > VoLTE (or 4G/5G Calling). With VoLTE on, the data connection stays live during calls so WhatsApp keeps receiving messages. If your carrier doesn't fully support it, switching the preferred network type to 5G/LTE and toggling Airplane mode briefly can re-register the data session. See how others solved this on Reddit

Make sure the bottom microphone (the small hole beside the USB-C port) isn't blocked by a case or debris, then check Settings > Apps > WhatsApp > Permissions > Microphone is set to Allow for app calls. Reboot the phone to clear any stuck audio routing, and test with a voice recorder app to confirm the mic captures sound. If it works in the recorder but not on calls, clear the cache of the Phone and WhatsApp apps via Settings > Apps, since a software glitch can mute the outgoing channel. See how others solved this on Reddit

Open Settings > Apps > WhatsApp > Battery and set it to Unrestricted so the system stops killing it to save power, then turn off Settings > Battery > Battery Saver. It also helps to lock WhatsApp in the recent-apps view (open the app switcher, tap the app icon, and choose Lock/Keep open) so Motorola's memory manager won't clear it. Avoid third-party task-killer apps, which aggressively force-close background apps and break message delivery. See how others solved this on Reddit