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Hello, my name is***** you for the question. This is typically caused by a COMMAND module issue. In most cases the computer can be updated and the system will work fine afterwards. In some cases the module will need to be replaced. I always reprogram it first to see if it will hold the new program. If not then the module will need to be replaced to fix the problem. This is very common on this and just about every other Mercedes with this system. I hope this helps. Please let me know if you need further assistance.
If you reprogram it does it have to ve done on a computer or at the dealer and if i have to replace it where is it located ty
It would have to be programmed at the dealer or at a shop that has the correct equipment, which is rare for this system.