Has anybody had this problem I have a galaxy note 2 phone and it went black. I got Samsung to repair it and now 4 months later I hve the same problem. It is with Sprint although I think the problem is with Galaxy. what a piece of junk
I had a similar problem, turned out to be dust by the proximity sensor.
I blew some compressed air through the ear piece speaker grill and it dislodge it.
Its been working fine ever since.
Its something easy to try, hope it works for you.