My previous '00 4.4 would do this on occasion, and I always felt that it was an alarm/key transmitter issue. It only happened occasionally and wasn't too much of a pain so I just let it go. It seems to me if it is happening that often that someone with the proper scan tool software could pick up the problem at a shop. Maybe its time for the experts.

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Dave

'06 E90 325XI Monaco Blue/Terra Leather, Sport, Premium, Steptronic, Cold Weather
'05 GMC Envoy
'85 911 Carrera
'66 911 Work in progress