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First check connections to see if any corrosion . Then use a code reader see what all codes pull up (write down) then clear them out and see what happens .
The first thing that need to be done here is to have the fault code(s) read that are recorded in the computer's memory (PCM) when this happens. Do not keep driving the car or you will damage the engine and/or the transmission.
More likely than not, you have the famous broken solder joint(s) at the coil inside the FOB...if that is fine and all solder joints look fine , then you had best get MB, or a good Mercedes Independant garage, to check the EIS and make sure it sees the key
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