Stock non-rooted 3.29.651.5 EVO Rebooting continuously!

[yachtspecco]

This started a couple weeks ago and when it decides to shut off and reboot it goes to the white screen for a few seconds and then reboots again continuously until I pull the back cover and remove the battery. I am not as adventurous as most on this forum because I rely on this for my business hence the un-rooted stock rom.
Cleaned the battery contacts, pulled SD card and reinserted to clean those contacts. It seems to be possibly be heat related??? Anyone else having this issue with stock Rom? I searched and have seen similar issues but usually related to rooted custom roms being the problem.
John