That was my thought as well. However, I couldn't get into safe mode after my second reboot and the control panel would close after a few seconds. It was as if Win was trying to complete the boot but could get past one driver. The PC was still basically functional, Chrome and the internet still worked but the desktop was basically in a refresh loop.
Everything appears to be stable now and I just checked the catalyst driver was not reverted to an earlier version. Argh, if it happens again and I don't know the cause or solution I'll probably just image the OS drive, try a fresh install in an attempt to identify if its hardware or software related.