[Turd]

My 2001 Boxster S with Litronic, warmly referred to as "Turd" (Shape and Macadamia Brown colour) has just developed the same problem. Both lights do it in unison so I am ruling our anything to do with individual bulbs or ballast for now. I'm thinking its the switch on the dash or some other central mechanism before the switch's "message" goes to the individual headlights. Mine is also intermittant and can work just fine sometimes.

Did you ever get yours resolved? If so, what was it? The switch?