Hey Jimsaq,

I downloaded the 2008 x5 manual from this forum and it says auto hold is automatically deactivated if the vehicle is braked to a stop. It doesn't say parking brake. The actual manual I got when I got my X5 is in the truck. I'll check the manual tonight when I get my truck from the garage. Thanks to you and everyone else for your responses. Like rh71 said, it seems to happen if I'm at a very long light. It's happened maybe four times since I got the truck in May. I don't want to go to the dealer because it probably won't happen at the exact moment they check it just like the constant squeaking/rattling from the cargo space miraculously disappeared when I took it in to get checked out! It also says it deactivates if it detects that there is no driver in the front seat. Every now and then, I'll raise myself off the driver seat to reposition myself. Maybe that deactivated it.