Some more bizarre, interesting and repeatable behavior.
Went to watch the same program that had issues yesterday when I started the thread. This time from the Joey connected to the hopper, rather than the other hopper....same problem, no audio. And this would have been after the nightly reboot. So being fed up, I figured the recording was bad and deleted it. Then went to Live TV and wanted my previous channel so hit the button to jump back to it. Rather than jumping to the previous channel it started playing the recording which I had just deleted, only this time there was audio and it worked fine. So I stopped the playback and restored the recording. Hit play and the problem was now back, no audio. I was able to repeat the same steps, delete recording, go to live tv, then jump to previous channel and have it start playing properly again. Very odd behavior. Only thing I can see different on my end over the last couple of weeks is the hopper now has over 100 recordings vs the more typical 20-30.