My BIOS is set to automatically power itself back on after shutdowns / power losses / reboots etc.
Mine too. And I also had a rig restarting several times per hour with v9. Also I have exactly identical rig running rock solid since v9 release.
In all rare cases in the past when my PSU engaged a protection it didn't simply restart. I actually had to unplug it from 220V source.
My point here is don't blame your quality PSU or Claymore
Or blame him for writing a miner stressing your hardware worse than Furmark, Version 9 is now good for me