Sometimes when I receive an incoming call on Zoiper, I am unable to interact with the screen.
I swipe from left to the right, but it does not respond. It's obscure as to whether it's a network issue or some other kind of problem. The application does not indicate what it's doing in this case and it's obviously misbehaving on this phone.
I have to wait until the caller hangs up or it goes to voicemail, turn on the phone, open the lock screen, and the incoming call is still in the notifications menu.
It seems that it's caused by the lock screen because it seems like the lock screen flickers when the zoiper is ringing from sleep. Anybody heard of this kind of problem?
I'm unable to reproduce the problem unfortunately because it's sporadic.
Basically however whenever a real person calls me, often I can't answer the phone.