I don't think that is the problem. If the fuse was out, a number of functions would not be available, e.g. all the interior lights.
Instead, I think you have a problem with the imfamous door microswitch problem: inside the door lock, there are three small switches soldered to a circuit board. These switches tell the comfort module about the status of the door and lock. Due to temperature changes, the solder joint of the switches crimp and creep and eventually they tear apart. Then the status of the door is no longer known to the control unit. This results in the behavoiur you describe: no lights when opening the door, relocking of the door and also the fuel pump won't preset before starting the car.
Solution? Either a rather expensive door lock module switch at the dealership, or a slightly complex DIY taking the module out and resolder the lock joints.
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