Default Rear buttons "squishy"

Hey guys.

I'm super happy with my G2, and coming up on 4 months with it. However, I have a problem.

The power button and volume down, overnight and out of nowhere, got really squishy and weird.

There's no distinct "click" anymore, but they do work. It feels like I'm pressing a button with a pile of rubber under it.

The volume up button works perfectly normally, which adds even more to how odd the other buttons feel.

So, how do I fix this? Can I replace only the buttons, and if so, how hard is it?

Also, is anyone else experiencing this issue? Once again, the buttons do work perfectly, they just aren't behaving as they normally do.
HTC Wildfire (Sold) -> LG Optimus 2X (Sold) -> Motorola RAZR XT910 (Dev platform) -> LG G2 D802