I've problem which is a bit similar. At least it relates to sleep mode as in the case above.
Bought n810 coouple of weeks ago. It had Chinock and I reflashed Diablo.
Now when I'm leaving device for several hours it loses all the applets from screen (home gets just clean) and settings of panel ressets as well. Sometimes it even stops reacting on keyboard and stilus and all aI have to do is restarting.
Maybe somebody knows what it could be?
Thanks in advance.