Apple Watch series 1 screen popping off at the bottom

Back in the day, Apple extended its service coverage for Apple Watch (1st gen) models experiencing expanded/swollen battery problems to three years, covering customers for service for an additional two years beyond the complimentary 1-year Limited Warranty that it provides with the device.

That's 2 years additional to the 1 year limited warranty. So if you haven't got any additional cover in place, I would say it's time for a new watch. Perhaps a moot point, but current models go way beyond what S1 can do as well.

Check out this new user experience with the same issue though. So it might be worth while to contact Support in any case:

https://discussions.apple.com/thread/252828226?page=1