My car sat for a few hours now, I went for another drive, a reset definitely fixed it, my car no longer has a hangover.
here is a very good starting point
http://www.bimmerfest.com/forums/sho...d.php?t=561237
and here is the cheap option of the cable, lots of info
My DIS/INPA/SSS/CARSOFT/NAVCODER Interface. - Bimmerforums - The Ultimate BMW Forum
I have heard of other people having the exact same problem i had and what you have.
more info about my car is that the previous battery was still the original, 6yrs old. and it was a bit worn out. thats why im guessing there would be some kind of adaptations controlling the regulator which I reset
I'll post more findings in this thread.