Yo Neighbor,
My experience was that I had two issues that indicated lack of continuity from the doorbell to the house wiring: (1) RING doorbell battery was not charging, and (2) RING doorbell pushbutton would not sound my interior Chime unit by BRAUN. The washers fixed both. I still think there is a design defect in the baseplate that the doorbell attaches to via the spring fingers and also the house wiring attaches to via the two screws. I did not try to determine exactly how the washers solved my two problems because that would probably involve damaging the baseplate.
Ed