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It definitely sounds like one of the blind spot warning senors in the bumper is starting to go bad. This connects to the vehicle network and causes other problems not related to the blind spot i.e. the brake hold function and possibly the seat belt extender. How many miles are on the vehicle? This should be covered under the 4 year/50,000 mile warranty.
Are you in the U.S.? All U.S. models have a 4 year unless in Canada/Mexico maybe.
Probably trying to get you coverage before you go out of the bumper to bumper. Mercedes have always has 4 years from date of purchase.
You must have purchased your car in March of 2013 so you should be covered until March of 2017. I can confirm this with the dealer if you like. If you need any more assistance please let me know. Please don't forget to rate me, thank you!
Hi, I'm just checking to confirm your warranty was still valid and the problem was corrected?