i was reading with my DR800SG an ePub with the battery half full. suddenly the device showed a massage-box "goodbye, this device is shutting down" and it did. it restarted itself, rebooted, and after a while it came back at the front page. i didn't do anything then reading...
so, I went back into my book, what took 2 to 3 minuted before he did that.

anybody had the same? or knows why happened?