Aside from banging at the screen, or the sides of the screen, nothing works.

Once it got cold outside, the screen decided it didn't want to respond to touch anymore.

Weather is warming up again but the touch screen is not being a touch screen. It's being a douchecanoe.

Now I'm stuck with the bass, treble and balance settings I had when the touch screen stopped working.

Only "workaround" is using the knobs on the side of the touch screen (limited) and the steering wheel controls.