Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
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This can be a fault with the drivers door latch itself.I have seen the door latch fail like this and cause the lock issue as it can send a false signal that the door is opened.In this case it will not lock with the interior button and when the remote is used it and the other doors will not lock due to seeing a false signal that the drivers door is opened when it is not.
I would have the drivers door latch checked/tested to see if it needs replaced to correct this fault as I suspect it does.
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This can still be an issue with the latch itself as this is one of the more common faults.I have also seen control unit/ecu failure or intermittent failure cause electrical issues like this as well.Unfortunately in order to pinpoint the fault here this will have to be checked (first by having the fault codes checked with a scan tool that will plug in and communicate with all computers on your vehicle here) and tested when the fault is occuring to see if you have a faulty latch needing replaced or if this is an issue with a control unit/ecu.I suspect the drivers door latch as this is most common.