The two bottom buttons don’t depress in and out. Did they ever? Is it time for a new one or am I going a little crazy?
This has happened to me since day 1 with the Garmin 130. I found sport drink would get in the buttons and cause them to stick. I would rinse it in water and it would be fine after.
You might also try electrical connection cleaner spray. I use this on my Goldwing buttons and it works great.