My HTC One Max's screen often comes on during calls. Then the touch screen reads my face's contact with the screen and acts according to what it thinks I selected. I have ended up several menu layers into apps that opened because of this. But worse, I have frequently had my calls mute - so the person I am talking to can no longer hear me.
I have had my HTC One Max less than a month, and it has had to be replaced twice, once because the 3G radio didn't work, and the second time because of this issue. Well, the current replacement has the same issue too. I used Android Sensor Box to test the functioning of the proximity sensor, which should be what controls this function. It appears to work, but my experience tells me that it stops working a few minutes into a call.
Your ideas and suggestions are welcome. I love the phone, but this is a problem I can't live with.
Is anyone else experiencing this issue?