No such problem with my Mix 4.. Everything is working good except listening to Whatsapp sometimes turn off the screen and I have to restart the phone to get it back working..
Everything working smooth with my Mix 4 expect what's app sometimes turn of the screen and have to restart the phone to turn the screen on and it doesn't happens always but only sometimes..
Updated Mix 4 Miui 14 stable and everything went smooth as it should be ...
In Miui 13 Stable their was a problem that everytime an SMS comes phone got hanged for couple of seconds so just to confirm that bug patched in Miui 14 Stable...
Mi Mix4 what's aap is not showing names so everytime to see someone name in what's app I have to refresh it.. Before it was fine but from 2 days it's started this problem...