Drivers door not locking

New member here, hello to you all purchased a 2010 Mercedes 200 two months ago and had one or two problems but now I have a door locking issue. the button jumps up and down before it locks. Have any of you had this issue ? many thanks Mark

New member here, hello to you all
purchased a 2010 Mercedes 200 two months ago and had one or two problems but now I have a door locking issue. the button jumps up and down before it locks.
Have any of you had this issue ?
many thanks Mark

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