Hey guys, can apple genius bar diagnose this problem?
You should probably take it to the Genius Bar if you want to see if they're able to diagnose the problem.
I had an iphone (6) that was getting hot while just doing some web browsing and I kept it for a week. It didn't get better. I returned it for a refund. I wouldn't bother with the genius appointment because they'll give you a white box replacement. If that's ok with you then keep the appointment.
I wonder if they'll consider that normal, because playing games and the other tasks do stress the CPU/GPU.
Mine doesn't get terribly warm from watching youtube so I don't think its normal.
try to restore it, set it up as new and sync your info, re download your apps
(not from a backup). you'll lose your text messages though.