My mechanic put it on the lift with me in the drivers seat this weekend, and we did some tests. Miraculously the X5 started working fine again when we set it back on the ground. He told me to drive it to see if it would do it again, and sure enough it stopped working. I drove it to work this morning and it was fine. Got in to go to lunch and it was not working. It worked fine all day Sunday and half of Saturday.