Hi.
During the last weeks I've had problems with the xsession/sysuid service. In /var/log/syslog there where plenty of messages indicating a Floating Point Exception and respawning the service. I first blamed the nand chip going nuts, but then I bravely (read: lazily)run the fsck command over /home and the problems are gone. Only after doing this my /home/user folder was gone and had to recover contacts and settings for all the aps. I think you can try this,only using ubiboot kernel so that you don't savage your filesystem as I did..
However I'll not assume any responsibility
Regards.