Sticky buttons - the fix

I did the same to mine.  I am still waiting on my spring though.  I found that It was a little dirty in the housing, I don't think the spring will resolve my issue though.  Its worth a shot.  I feel like in my case its the actual button itself that has lost the click. If I recall correctly, when I had mine taken apart I pressed the button directly and it did not click.  I do not suggest taking it apart if you don't know what you're doing. In my case, the alternative was paying Garmin to replace it since it wasn't under warranty and I didn't want to spend the money on it.  Plus if I killed it, it was an excuse to get a Fenix 6.  Last Photo shows the actual button itself.  It seems to have lost its "click".  If the spring doesn't fix it, I may just try replacing the button for fun.  The PCB registers the button press, but I juts don't like how it "feels". Its way softer vs the rest.  Garmin doesn't acknowledge an issue, but does offer a replacement for a feee.

I'd love to have a link to the spring you got. I think I'll be good for about a year with the replacement unit I got, but expect it to fail again, so I'm trying to prepare for that.

Best of luck! If I remember correctly, the button itself (the black bit with the tiny seal in your picture, next to the spring and the c-clip) is a solid object, no moving part. The spring allows it to be compressed (when you press on it) or de-compressed (you release and spring springs back). The seal serves to keep liquid out when it actuates.

Not speaking for 'michagar', I got mine from here

https://sg.misumi-ec.com/vona2/detail/110302605250/?PNSearch=UM5-5&HissuCode=UM5-5&searchFlow=suggest2products&Keyword=UM5-5

Interesting! Thank you for the tip.

For what it's worth, I have had a Fenix 3 since it came out which never had this issue and I recently bought a used Fenix 5X which had a damaged back (no pusher issue). I bought a replacement case for it and the pushers look different, like a pentalobe with only 3 sections. Not sure how these would come off without the exact tool. Maybe the 5X does not have the same issue?

Hopefully Garmin will learn the lessons here. I did a bit more tinkering with the button recently. I am convinced the problem is due to friction between parts (the button, the spring, and the hole in the case that receive the button/spring). I happen to have some Dow Corning High Vacuum Grease around so I put a moderate amount in the hole as well as on the spring. Put everything back together and the button action is even better---super smooth now. Note that one needs to use silicone-based grease (i.e. polydimethylsiloxane-based) which will not adversely affects the rubber seal, important if one still wants the watch to be water-proof!