I'm not sure what to say, but have you tried to flash the sd card? S2's firmware doesn't save any settings but ip address, so I think that would be normal. Try to flash the sd card, update fw to the latest, and see if anything change.
I should have added that the File System Version says: Thu Apr 10 / the Cgiminer Version says 3.12.0
as well.
The box seems to running "okay" now...but last nights "hiccup" sure is strange.