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I'm having this issue since installing 13.8 beta 2 drivers. Rolling back to 13.8 beta 1 didn't solve it.
Also, after that happens or even after the PC has been idle for a long time games perform poorly. For example, parts where I have 70fps I get 30ish fps. I have no artifacting nor high temps. This doesn't happen all the time. sometimes it happens a couple of times in a minute and sometimes it happens once a day or so. Some game sessions are completely unaffected. Seems to be something on the software side though....
7970 DD mild OC stock clocks. 1035/1485 (stock is 925/1325).

What could this be?