Seat Moves On It's Own!!??

[wroot]

I have a 2004 Boxster S with the power driver's seat and seat position memory option. When my wife drives it, the seat has taken to moving all the way back by itself, and the switch on the side of the seat will not move it back for several seconds. When it does work again the seat will not stay forward. Sometimes this can happen while driving which is a big problem, since she is short and when the seat is in the full back position she can't reach the peddles. To compound the mystery, this almost never happens when I drive it, although it did move back on me a couple of times when I made a hard right turn.

My Porsche garage ran a full diagnostic and found nothing except that the battery was weak, so we thought that might be the problem and replaced it. He ran the seat back and forth a dozen times and it was fine. When we picked it up from the garage my wife got in it in front of the mechanic, turned on the ignition and moved the seat forward. In about two seconds it moved all the way back by itself and wouldn't come back forward.

We're stumped. Has any one else had this problem, and if so how did you fix it?

Thanks much for your help.