My CLK320 has problems when I raise and lower the top. Periodically, but not always, the top will not fully raise or lower. It stops midway and I have to continually turn the key off and on to get it to work. My mechanic has checked the module, the grounds, the switches, and the wiring in an attempt to fix the problem, but we can not find the problem. The computer sometimes shows it has a bad switch but the switches have all been replaced. Anyone have any idea where to go next?