FPS down the rain!

Okay, here's the prob.
I play for 20~60 minutes fine. After that my fps (usually 100+) goes to 15~20. WHen I keep playing or when I close crossfire right after that. My computer logs off. Totaly.

It's really weird. I didn't know if it is the computer or crossfire. But It only happens when I'm playing crossfire. I got an acer (touchscreen) if that matters.

Sorry if this was posted already. Do you got any solution? Or can you at least tell if it's my computer or crossfire. Thanks alot. (maybe my computer gets overheated? O.o but it only is when I'm playing crossfire)

Anyway, thanks in advance.

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