Thanks for the replies. After giving it some more thought. I tend to agree that the window control switch on the door is the likely culprit. Also, I forgot to mention that it was raining when the problem first appeared. So, I am thinking that moisture is getting into the switch, and contributing to the intermittent contact being made while power is available to the switch. I will order a new switch next week, and look to see how it is supposed to be protected from moisture when I remove the inside door panel.

Thanks again for the help.

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'02 X5 3.0i, build date 02/2002, 135k, stock (for now)