Randomly Rebooting Mac OS X 10.8 Mountain Lion

Hello does anyone have any issue Randomly Rebooting Mac (OS X 10.8 � Mountain Lion)?
anyone in here would help me out fix that problem?
Thanx a Million
Answer #1
what you running it on? did you download the disk or is it what your mac came with
Answer #2
i download from disk… got any idea?
Answer #3
https://discussions.apple.com/thread/4148301?start=15&tstart=0 hopefully this may help
Answer #4
Thanx for the links infor, still cant find the way solve the problem
Answer #5
gosh this suck keep restarting even i do fresh install