Pull the switches, take them apart CAREFULLY and inspect them. They've got metal roller arms and ball bearings inside that do the switching mechanically. These can become dirty/corroded and cause faulty switching. Clean and re-assemble.

Could also be the wires. I believe some of the wiring runs through the door, near the hinges. With your opening/closing door problem, it could be some of the wires have cracks in them at or near the door hinge area and this could also be causing your problem. Good luck!

__________________
Chris
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired

"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon