The infrared remote coding for the Vizio has a few codes that are the same for the radio. Considering we probably have more remotes for devices in the coach than forks in the silverware drawer not surprised it doesn't happen more often. I've got two TV's, DVD, Sat receiver, dash radio, dash camera monitor, and awning LED lights = 7. Forks other than plastic = 4.
Got a make and model of the radio or could you post a pic of it? Might have an owner that could point out the sensor location on the radio. Cover it with a piece of black or other opaque color tape and problem solved. Kind of like fixing the dash "Check Engine" light.