"Remove Key" Message on Mercedes

A friend of mine has a Mercedes (3 series ?) that won't start intermittently... the message on the dash reads, "Remove Key" once removed and reinserted, it sometimes will start, sometimes not. There are no check engine lights or codes. Any ideas on this one? I'm thinking it might be the key itself maybe? is this a dealer only fix? Thanks in advance~ Doc

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The Doctor
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