Frequent SLF...if there were no passengers, I would be flying cargo and GETTING PAID ALMOST TWICE AS MUCH. Fedex and UPS pilots are getting more than pilots at major US passenger carriers.
its because the passengers won't pay full freight (excuse the pun)...but enough of that.
ALWAYS keep your seatbelt fastened...try to time your bladder to avoid using the airborne toilet...if possible. and if you get up , finish your business and get back to your seat and seat belt. I know of one CAT occurence in which the seat belt sign WAS ILLUMINATED and a passenger went to the LAV...hit his head, broke his neck and is now a quad.
so be careful!
PS
we must also consider the remote possibility that wake turbulence may have caused the rolling moment.
BUT the computer situation is worth a good long look...hope there is more posting about this aspect...and a manual landing...did they have to use rudder and trim only? Or,was it just a non autopilot landing?