I'm having a similar problem with my 98 Boxster. It has been at the dealer now for several days. They told me that they think my car is possessed because it starts working for about a dozen times and then when they think they have it fixed it stops.
They have checked all micro switches and relays and can't seem to find out what the problem is. I want to sell the car and I know it won't sell without the top working. The car only has 52,000 miles. I have seen on other Forums that there is a common problem and that some people have had success with Porsche paying for the dealers time. Meanwhile, my dealer has several hours into this and has no solution for me.
Does anyone have a recommendation on how to fix this?
http://www.987forum.com/forums/newreply.php?do=newreply&noquote=1&p=190574#