I have my Roku streaming stick+ plugged into an Onkyo receiver. When I first installed the stick, I read that it would not control the volume on AV equipment, so I added the receiver remote to my array on the coffee table and played two handed TV. One night, about a month ago, I accidentally pressed the volume control on the Roku remote and gasped as the receiver volume reacted. I was elated and spent the next several weeks adjusting volume with my Roku remote.
Suddenly, about a week ago, this function stopped working. I've been scratching my head trying to figure out what happened. I think that to enable it, I might have had the Onkyo remote upside down in the dark and pressed a button that enables CEC. But I just can't figure out how it stopped. I feel like a Griswald trying to turn on the Christmas lights. (Sorry for those who haven't seen Christmas Vacation).