Just got mine 2 days ago and same thing is happening to me 🙃 I got the limited edition one too. I seen some people claim sanding the area of shell down a bit works but I messaged valve to send it back. It’s very annoying when the button sticks and sounds like it is widespread sending it back might not do nothing cuz it’ll happen again lol.
Just got mine today and street fighter 6 runs pretty good 👍
Got my le yesterday I guess it is a widespread issue because of the design of steam deck. I tried this method of a piece of tape and it’s working so far. https://youtu.be/aBg0rwpATAg?si=b1TVr_s5y9QD1YFq