Hi All,
I've had this happen a number of times recently as well. Seems to be more often since the last patch but could be coincidence. Most often it happens when I am in flight not touching the keyboard. I've had it happen when I am in the bombsite getting ready to drop and well after I have calibrated...or I will be in flight on auto climb out in a fighter and it just drops to desktop while I have not been doing anything.
I do have TrackIR5 as well...
Cheers,
Elec1