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Hi, my name is***** does not sound like a bad key this sounds like a bad electronic ignition switch. I believe that you have a faulty contact in the switch. If the car also cranks but does not start on occasion the problem could also be the ignition switch or it could be caused by a faulty crankshaft position sensor. When the sensor malfunctions it will cause a crank/no start condition. The problem usually occurs when the engine is hot. I'd suggest replacing the ignition switch and see if it solves both problems.
Let me know if you have any questions.
A used ignition switch will not work. You will need to have the switched replaced at a Mercedes dealer and have the switch programmed to the vehicle. An alternative would be to purchase a complete used set of an ignition switch with keys, steering lock and engine control module from the same vehicle.
Let me know if you need anything else.
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