The reason for the high rate of electrical "glitches" on modern MB's is simple. Much of the vehicle wiring carries data (voltage coded or digital ). Everything from the interior lights to the heated seats is digitally controlled. In the good old days the vehicle wiring carried the LOAD. Very easy to diagnose. Todays' CAN networking systems allow more features and accessories to be built into vehicles without adding weight or taking up space. Timing issues between different components, faulty software, etc. are just some of the things that can go wrong. It reminds me of something my grandfather used to say. "The more complicated you make the plumbing, the easier it is to clog the drain".