That's usually what does it. I had one go out a few years ago. Bought a 4-pack on Amazon and replaced them all since they looked like they could use a refresh. I also had one valve that needed a diaphragm replacement, but that's also pretty easy.
Liberals never met a slippery slope they didn't grease.
-Me
I wish technology solved people issues. It seems to just reveal them.
-Also Me