Question: phone is vibrating, giving a sound but screen is black and cannot see and answer the incoming call
my incoming calls aren't displayed on the screen (iphone 6s). the screen just stays black, so i can’t see who's calling. (it does vibrate and i can hear the the sound/melody). iphone reacts only when pressing on/off button, but that’s the moment incoming call is rejected and the screen shows miscall. the issue started over a year ago. after 4 visit at apple store, restarting all settings, setting up new iphone (without the backup) - new iphone has been given to me by Store. issue did not dissapear thought. i am all the time updating the software whenever it appears. can someone help me with this? issue appears as well once a while when after half an hour not being used, only pressing on/off button wakes up the screen.
iPhone 6s, iOS 11.2.2, Started10month ago,with earlier ios