New wrinkle: The TV Adapter was working better with the analog signal, but after being on for 10-15 minutes that signal cuts out and I get no audio unless I reconnect the DAC power supply (also tried a different adapter), and then the same thing happens 10-15 minutes later. So I’ve gone back to the Toslink digital audio and just try to deal with the volume spikes by turning down the adapter streaming volume while waiting to speak to my HAS at Costco and hopefully getting an appointment to try further tweaks to the Hear Suite streamer settings. At this point I am ready to return the DAC.
BTW, Philips advertises remote adjustments through the HearLink Connect app, which I downloaded weeks ago, but last I heard the fitter said they are still working through problems with that and he’s unable to use it to adjust my HAs. I am rapidly getting fed up with Philips.