The door lock motors get tired, happened to your car and to mine, initially all my doors opened on one click, then as time went on one of the rear doors required two clicks.
My new V6 works perfectly on all four doors, but I am aware that it's only a matter of time before at least one of them plays up and will then require an additional click.
Grease everything you can, connecting rods, anything that could cause the weakened motor more work, or replace if you can get a good s/h set.
Regards
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