My brother gave me his phone to fix this weekend because it randomly reboots if you do not turn off the screen immediately once it boots up. I thought this was a kernel/software issue so i wiped the phone and updated it to 4.3 (no knox). This did not solve the problem. Now for the weird part: if the phone is on powersaving or the screen brightness is all the way down, it will not reboot until both of these two conditions are broken. This makes me think it is a power-management issue. Any ideas or suggestions on how to fix this? Thanks