The driver's side door is loose.
I will assume that the door is hanging, and does not line-up properly when closed. There are a few situations that can cause the door to hang loose: The hinges holding the door on may have started to fatigue, or the door itself may be broken at the location where the hinges attach. Have a trained mechanic inspect the mounting locations of your loose door, and determine if it can be repaired, or if replacement of the door assembly may be necessary.
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