My 996 tip did that occasionally. It turned out to be the plastic ignition piece on the back of the switch. Didn't figure it out until a lot of other stuff started happening, but once I replaced it I never had the problem again. It was another 2 or 3 years before I sold the car.
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2001 Boxster S 3.6, 2003 E46 M3, 94 968 Cab, 80 911 Weissach Edition, BMW 1200 CLS
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