This is most likely because of your stage 2 set up. On my e60 when I would leave my can tool plugged into my car over a couple of day I would get the same error. But this only happened when I left it plugged in. This is also happening to an F10 owner on the other site who also has stage 2. This did not happen to his car when he had stage 1.... Just a thought, but you have to check all avenues, and this seems like a logical explanation.
2012 535i M-Sport
Previous BMW's: 87' 528e / 04' 325i / 07' 335i / 08' 335i / 08' 535i