Here's an update on my G1.1. I deleted all my user settings, which (I think) restores the unit to factory settings. Then I rebooted and reestablished wireless connection using my iPhone. Unit plays for a few songs and then gives an error msg while endlessly buffering. In other words, same problem. It seems to be worse when I play a mix or one of Tidal's playlists. I've been able to play one album in its entirety.
Audio Advisor got back to me with a shrug saying that Auralic left us all "high and dry" and that AA can provide no support or any suggestions other than to Google it. I guess I shouldn't be surprised.
So, I'll keep monkeying with it and hope for the best for a while. However, I suspect that this problem will only get worse over time and I will have to replace.
I note the recommendation for Aurender and have been looking at them. Does anyone know anything about the PS Audio Air Lens? I have their Stellar phono pre and am happy with it.

