auto restart on iMac ?

[[[ForeverAlone]]]

Guys, recently I encounter my old iMac will auto restart . All along I put to sleep mode while go to bed

recently , I think after update the latest OSX , weird ..always morning the old iMac will auto restart without reason than I just to sleep , it will auto restart

middle of night never

I also never download any " funny app or open any suspicious link as we all know might be malware or virus ..or hacker lure you to down load their stuff "


but my new iMac don't have this auto restart problem

why I say weird because while doing my work on the old iMac it will not auto restart even on screen saver mode


Put to sleep mode , than recently funny is early morning like 5am , 6am , 7am is will auto restart ... for no reason

hmmm ...I doubt is hardware faulty since normal usage daily during the day ok never auto restart .

I even turn off the whole system and on again still have this weird problem.