Down button is harder to press and has more travel compared to other buttons

I am using FR970 since late July 2025 and from past few weeks i feel the down button is harder to press. It has more travel compared to other buttons and almost feels like it clicks twice.
I went to showroom to show the issue to the salesman to get ideas but in doing so i pressed it quite some time and probably hard that the issue fade away for him it register it. He still asked me to take it to service centre. Not sure how to demonstrate it to people in Garmin service centre in Singapore as the salesman himself said it will be a tough one to demonstrate if there is a real issue. I also observed it comes back mostly after a swim or a sweaty workout session. Anyone else faced such an issue before?Am i using it incorrectly? 
I do feel i use down button more than others like to log Hyderation, check health stats and stuff. I am trying to use touch more but got big fingers and i also feel such a premium watch should have pretty good hardware.