Power button to ends call do not working

[Malinda Savanadasa]

In LG G Flex when im using the quick window case, power button ends call do not works. Please help.

 

[Relgoshan]

In LG G Flex when im using the quick window case, power button ends call do not works. Please help.

Some other brands had the opposite problem, after update power ALWAYS ends calls even when disabled. Google showing us how pro its QC is again...