My 2004 5-Series is recently doing some strange things. The analog and digital controls on my dashboard have been going in and out after driving for 15-20mins. When it goes out, the turn signals and AC stop working also. All the other electrical items seem to continue to work fine (ie, windows, radio, door locks, etc). The dashboard will light up for 1-2 mins, the signals and AC would work for that period; and then they would all stop working again.

At first I thought that it might have something to do w/ heat, because it tended to occur in the evenings after sitting in the sun all day. However, this morning the dash lit for a few seconds and then went out again.