Polaroid remote channel button does not wor...

I had the same problem. The fix is actually very easy. Just re-tune your channels in and your remote/channel buttons should work again.

This looks to be a good hint. After reading the solution "I had the same problem. The fix is actually very easy. Just re-tune your channels in and your remote/channel buttons should work again.", I checked my remote and saw that there was a sliding button "TV/Cable" and it was on "Cable"

I moved it to TV and it started working.

This could be a dumb solution but just wanted to suggest...