litespeedone

I have a 2008 S550 4matic with dynamic, multicontour seats. The driver's bottom cushion (adaptor) does not inflate most of the time (it decides to work about once or twice a week). When it does operate it will deflate after about 5 minutes or so of driving. It seems to stay inflated longer if I put more air in it while I'm driving. All other multicontour/dynamic seat functions (seat back, pulse, dynamic, shoulder, lumbar) work fine. All functions on the passenger seat work fine. I tried swapping the passenger and driver seat modules and no change. I have a carsoft diagnostic tool and it says that there are no error codes for the seat bottom nor the pump. I have noticed that when I select the seat bottom, a picture of the seat bottom and pressure grid shows up with a white background and sometimes it shows up with a black background.

Any ideas??