I have the galaxy watch 42mm bluetooth version and im starting to have problems with it, its starting to overheat when charging and its starting to die faster when not in use. I will include my watches information if that helps.
Model number: SM-R815U
Software version: R815USQU1BRJ6
Tizen version: 22.214.171.124
Serial number: Removed from page.
Have you already given the troubleshooting article for when your device feels warm a try?
You can locate the article for review here: https://www.samsung.com/us/support/answer/ANS00076952/
I have tried what the article provides but every once in a while it overheats when charging so I take it off until its cooled down. But just recently the battery draining much faster than what its supposed to because I don't use my watch like that for the battery to drain that quick.
Have you tried resetting your watch?