Oh it's the worst, and so disheartening.

https://www.amazon.com/dp/B00KHY3U9W?psc=1&ref=ppx_yo2ov_dt_b_product_details

I got it off amazon. As well as this silicon: https://www.amazon.com/dp/B0002BBX3U?psc=1&ref=ppx_yo2ov_dt_b_product_details

I still have to be careful where I clamp the lid down, but at least it stays sealed.

https://www.amazon.com/dp/B0002BBX3U/ref=cm_sw_r_cp_apa_i_MVqfFb3FHXG64

I bought the watch when they first came out near the end of 2016, been rocking it for a long time so kinda expecting issues to start popping up now.

I bought the power button flex from here: https://www.amazon.com/Ubrokeifixit-Compatible-Replacement-Samsung-Frontier/dp/B07VHMM54P

And for the seal I'm just buying a tube of silicone to apply around the raised edge once I know the button works fine. This is the silicone I'm getting: https://www.amazon.com/gp/product/B0002BBX3U/ref=ewc_pr_img_1?smid=ATVPDKIKX0DER&psc=1

Hopefully we both can have working watches soon!