I have this problem with my S4 Active, and I had it with my Note 2, but I have never managed to find out why. The S4 is on the official ROM, only rooted, while the Note 2 had different ROMs: When I'm using the phone for surfing, or whatever, so the display is on, I don't get the incoming call screen where I can slide to answer or reject a call. I have to turn off the phone with the power button and wait for 3-4 seconds, and then the display will come on and show me the call screen. I have tried changing dialers, between original and a couple of different third party dialers, but it doesn't change anything. Has anybody else seen this, and do you know the reason or the cure?
