Kobo HD did unprompted factory reset, lost everything

[twowheels]

....lost my reading progress, my KOReader configurations, downloaded dictionaries, all books that were on the device -- gone -- completely fresh wipe.

I plugged it in this morning and saw the LED flashing -- opened the cover and saw a screen I'd never seen before and a few seconds later while I was getting ready to take a picture of it to ask what it meant it rebooted and went through a full factory reset and then the whole setup and registration process.

EDIT: Clara HD, not sure how I missed that in the title.