Update: I didn't get back to it until evening. I don't know how to check for vizio firmware updates but tried different things and thought I'd give you a little more info. When audio stops, we hit "skip track" and then hit "play/pause" and audio came back on for a short (40 sec) time. Then repeated the process with same results. Does this tell you anything?? Do you think I should go ahead and uninstall the APP and reinstall? I saw other people had had similar problem with Samsung TVs. It just seems strange one tv in house works and the other doesn't. The one that doesn't is the older of the 2 so wondering about the tv update you suggested. How do I do that? Thx!
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