It was of course the newest FW because thats always the most obvious reason of problems. It was not really a reboot, more like a very fast reeboot. No, i did not restored the ipad, i dont even plugged it in my PC. Its complete new system without a sync to a computer because i dont need that.I haven't had a lockup like the one you described in a while. Are you running 8.1.2 and did you restore your iPad from a previous setup?
what worries me a bit is the fact that i sometimes get electric shocks when i touch the outer ring of the homebutton. Not because of the ipad but because of i am charged up myself, i also get it when i touch other grounded objects from time to time. I just hope such electric shocks did not harm the ipad and its good isolated against such things. I also have some problems with games, they are crashing to the iOSD main screen very often. Especially the App table top racing.