Keyless-go spins C215

Hi all, lately the AI shows me the following info every time “Keyless-Go card is not recognized” and this continuously every 5 seconds paired with a signal tone. Although I have the Keyless-Go card garnich with me. But if I leave the Keyless-Go card in the vehicle, all 5 seconds the doors open, as if I would hold each time at the door handle, although I am standing outside. Did any of you already have the same problem on the vehicle?? What would you suspect, what could it be? possibly at the contacts in the door handle?? I thank you already in advance for all the answers! blue320