My Samsung Galaxy Watch (rose gold) bought last June has had a sticky top / back button for the last few months and is getting worse. It sometimes is not usable at all. You have to really push it a few times to get it to work.
I have tried restarting and completely resetting but that doesn't seem to help.
It has not been damaged so I am not sure what this is but I have seen online that lots of other people are reporting the same issue.