I have a 1998 C-230 and the power seats will sometimes refuse to work when I first start the car. After the car has been driven for some minutes, the seats start working just fine. All modes of both driver and passenger seats have the same problem simultaneously. The problem occurs about 50% of the time I start the car with the seats working normally the rest of the time. Does anyone have an idea about what could be the problem? Any help is greatlly appreciated. Thanks.