most absurd bug you ever seen?this one...help topic

Hi guys and happy New year
This the bug:
When I try to video-rec in landscape mode.....sound missing or it's really low
In vertical mode,everything's goes right
I hand tried everything,also restore phone
Mine g2 is stock,no root inside and I don't cover microphone
Many thanks,you're mine last chance guys
P.S.
Phone is 2year's old....do no have assistance without payment
Bye