I have the same thing on my RX480 after the newest driver (17.7.2), except my PC isn't restarting. I've used another program (HwInfo64) to check the temperature and the card does run a few degrees warmer then normal. Anybody know if there is any danger of overheating the card now that Claymore doesn't register the temperatures anymore?
No. All cards are protected from overheating by firmware, unless you changed that, you're fine.
Don't use this drive. Don't brings nothing good only pain and suffering.
I'm still using 16.9.1 version, very very stable and doesn't low your hashrate.