I notice the top of the phone gets really hot when I play games. So far I've only been testing plants vs zombies 2 with a cpu temp app and the cpu temp averages at 62 celsius which is fine on a cold day. However, on a warm day it tends peaks into the 70s and my cpu temp alarm goes off and I can't play more than a few minutes. I've tried to use powersave mode to lower the clock speed and it doesn't make a difference. I think the sandstone backing doesn't dissipate heat as well as a normal plastic/metal backing. I know the cpu is supposed to have thermal throttling, but I'm wondering if there are any non-stock kernels that may have a more aggressive thermal throttle.