Samsung Q60R channel changer stopped working after 1 day, volume, home button, etc all worked fine. Tried many different trouble shootings, nothing. Finally went to Samsung/settings/ and reset the tv to factory settings. Then re-did the setup procedure as if the tv were being installed for the very first time. Eventually got to the part of the setup where Samsung asks you about your cable provider. Then Samsung asks you to use the channel toggle on the remote to see if the channel is actually changing. Mine wasn’t, so I think I went to manual setup mode. Samsung asks you to enter the model # of the cable box your cable provider is using. I entered the model # (it’s on the back of the cable box), and then the channel was changing, that’s good. (I have cablevision, coaxial cable from the wall to the cable box, HDMI cable from the cable box to the Samsung). Completed the setup, everything working again. Maybe the communication from the cable box/remote/Samsung got disrupted somehow, I don’t know, but doing a re-setup worked for me.