[JimD]

My radio has demonstrated what seems to be the same thing you describe but I usually switch to the CD and/or aux input to see if that will work and it doesn't. You didn't mention trying anything other than the tuner. Somebody posted a "trick" that has worked for me and you may want to try. If you unbuckle a seat belt - or anything else that will cause the alarm gong to go off, the sound comes back. It seems to be a software glitch. I don't want you to be unsafe without the belt so please fully consider the impact of doing that before you do but I have found that will solve the problem. Otherwise, I have noticed that when I restart the car assuming it was off for awhile, the sound will be back.

Jim