How to prevent Wi-Fi from disconnecting during a WhatsApp call? On the latest version of WhatsApp (2.16.133), the Wi-Fi keeps disconnecting during a voice call. 

I suspect it's due to the screen going off (here's a similar problem on the iPhone), but it's just a wild guess. 

Anyone knows a fix for this? I'm on Android 6.0.1.
If you have Avast battery saver, uninstall it. It keeps disconnecting your wifi.