Radio/tape Cd Player problems of the 2017 Honda Ridgeline

I was listening to sirius radio with the truck bed audio on. I could not turn off truck bed audio. The off button had no effect. I could not figure out how to turn off the audio completely. I drove to store a few miles away. I traveled at 70 m/h. Truck bed audio still on. I turned off the vehicle to go in store, returned, and truck bed audio still on. I traveled 5 more miles at 80 m/h and truck bed audio still on. When I viewed the home screen truck bed audio was grayed out. I pushed every button I could find and finally when parked, at a drive through, it turned off. I do not recall the sequence of buttons I pushed. Anyway, not sure if it was the button pushing that finally ended the event. I am now afraid to use the truck bed audio. I am afraid if I cannot turn it off it will run down my battery.