Seeing a similar issue, but mine is not restarting. It just hangs on a blank screen during startup. The weird thing is it is 50% of them, but they're all Dell 2120's. Sometimes it works fine, sometimes powering it off and on a few times fixes it. Did the text boot and had the same disabled items as the OP. However when I did the text startup it actually got to the desktop.
Tried following individual USB keys to see if some are bad or good, but that didn't seem to follow any trend. Expert options force reset works in some cases, but not all. I've tried new keys and redownloading Ubermix. Something seems to be up with the latest version.
Anything else we can do?