WhatsApp for Motorola Edge 30 Pro

This buzzing is usually WhatsApp's audio routing fighting with the phone's noise-suppression, so first force-close and update WhatsApp, then go to Settings > Apps > WhatsApp > Permissions and confirm Microphone is allowed. If it persists, toggle Bluetooth off during calls and disable any 'Advanced calling/VoLTE' under Settings > Network & internet > SIMs (or Mobile network), since the codec switch often introduces the buzz on Edge devices. See how others solved this on Reddit

This is typically the bottom (primary) microphone or its noise-cancelling processing misbehaving, so first test all mics with a voice recorder app to find a dead one. Reboot to clear the audio service, then clear WhatsApp's cache under Settings > Apps > WhatsApp > Storage & cache > Clear cache; if only WhatsApp is affected, reinstalling it from the Play Store usually resolves the distorted or noisy audio. See how others solved this on Reddit

When the mic works on speaker but not when held to your ear, it's almost always the bottom mic being blocked, dirty, or faulty, so gently clean the bottom mic port and remove any case or screen protector covering it. Test in Safe Mode to rule out a third-party app hijacking the mic, and if the lower mic is genuinely dead it's a hardware repair, though clearing the Phone app's cache fixes the software cases. See how others solved this on Reddit

Heavy heat and drain on video calls usually come from the modem and camera processing running flat-out, often made worse by a weak signal forcing the radio to max power. Lower the in-app video quality, remove thick cases that trap heat, and check Settings > Apps > WhatsApp > Mobile data & Wi-Fi to ensure background activity isn't compounding it; updating both WhatsApp and the phone's software also patches known overheating regressions. See how others solved this on Reddit

Overnight warmth means an app or sync is keeping the phone awake, so check Settings > Battery > Battery usage to find the culprit, then restrict it via Settings > Apps > (app) > Battery (or App battery usage) and set it to Restricted. Turn off any 'Always-on display' and enable Adaptive battery under Settings > Battery; if a specific app like WhatsApp is shown holding the phone awake, clearing its cache and limiting its background data usually ends the drain. See how others solved this on Reddit

This is Motorola's aggressive battery optimization killing WhatsApp in the background, so go to Settings > Apps > WhatsApp > Battery (or App battery usage) and set it to Unrestricted, then confirm notifications are enabled under Settings > Apps > WhatsApp > Notifications. Also turn off any Battery saver and Data saver, which stops the delayed delivery and missing notification banners. See how others solved this on Reddit