Alternator/generator/regulator problems of the 2007 Mercedes Benz E350

Spent over $2k just on diagnosis and wrong fixes. It started with problems cranking. I replaced the key fob, replaced the battery, replaced the alternator, have had mercedes diagnose with no answers. My usual mechanic diagnose with no answers. A european speacialist replaced the alternator and tensioner pulley. Took it to a friend and we discovered that there was a leak in the sunroof running down the side of the car into the battery compartment. At this point various problems are going on. The windows, door locks, radio, cranking, all intermittent but not always at the same time. Took it to another mechanic who said the sans module is bad, at least. An $800 fix, then they could move to the next module and the next. Also maybe unrelated but maybe not. Low car light came on. Engine 'died' (vehicle lost all power) while traveling at highway speed or will jerk down gears and only continue to function in drive @ 40mph or lower. I had to pull vehicle over on side of the road with no power assistance steering or braking. This problem occurred with no warning and at highway speeds creating an immense safety risk. Many others have reported the same issue with this and related cars for this and nearby model years. Like them, I wonder why there is no recall. Mercedes benz will not replace these defective parts willingly and there are many of these cars driving down our highways placing not only the passengers at risk but other drivers around them.