Most of the major problems I have ever heard about happened to weekend and summer Boxster's. I have heard of very few problems with DD Boxster's, including my own.
You also have to remember that people that have a problem, like an engine failure turn to the internet to look for answers. There are plenty of boxster owners who have never had a problem, and have never been on a 986forum. So any internet only survey will be slightly biassed.
Perhaps the problem is that letting your Boxster sit is bad for it, and you need to take it out and drive it!
