Now and then I am working on a notebook and suddenly it reset itself. What I mean is that I am entering commands and when I type enter, the notebook command number goes to 1 and I have lost all definitions of functions I have made previously. It is annoying since I have to go back and resubmit all my definitions. I have not noticed anything special about the instances when this happens. I am using version 126.96.36.199 and I am running it on a MacBook with Mac OS X, 32 bit and 64 bit kernel.
As far as I could tell I did not click on any special key (the command, alt, control or fn keys) and I don't see any patter to when this happens. It happens now and then (I do calculations every day and this happens every 3-4 days, unexpectedly).
Does someone have an idea what provokes this?