i have a 2001 mercedes benz c240 over the last couple of weeks something has been going on with my car and no one can figure it out so if u have any idea of what it might be please tell me it started off when i was driving down the road and then all me electronics went out all my gauges on the dash my windows wouldnt roll up the only thing that was working was the fan that cools off the radiator it was loud and going wide open and the radio it has done this several times the car drives fine other than that and when i cut the car off and try to cut it back on the key wont even turn then i give it a few minutes then the car works like nothing happened but sometimes it takes a couple of hours to get it to cut back on someone told me it might be the ecu r the my key but before i spend more money i would like to be sure

 

any body have any idea need to get my car back on the road asap