Vera went crazy

VeraPlus was running fine, nothing was being changed or even accessed. Then, the entire system flipped out: some motion detectors were armed, random devices ((at least 20) were toggled, and the Vera was doing a heal. To my knowledge, nobody was logged in and the # of things that changed state within half a minute or so was large.

I rebooted it and it came back to normal.

Any ideas what could cause this or logs I can check?