Hackintosh crashes and reboots after about 15 minutes of use.

My Hackintosh used to work fine, and after a month of no using it. (I used the computer for windows (i dual boot)), it shuts off instantly after 15 mins, and starts up again. What could be causing this, and how can i find out what the problem is, and how to fix it?

Thanks!

submitted by /u/Naughty_Goat
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