I've opened tickets with Channels and Silicon Dust on these two issues, and while they've not been open all that long (more than 1 day, but less than 2), I've heard nothing back (other than the initial autoreply), so I thought I'd come here and see if there was anything to learn from the community.
Issue 1: Recordings for WLOS (113.1) have no audio. They used to. I've tested the channel using the HDHomeRun software and it has audio now. If I try to watch the channel live via the Channels app, it shows me still images (I can skip forward and back and get new stills, but it won't play). I turned on the diagnostic info and no audio information shows at all. Nothing of note in the Channels log. I logged a ticket with Channels by e-mail for this.
Issue 2: Recordings for WSPA (107.1) sometimes fail to start. The Silicon Dust log shows
20250227-00:59:30 Tuner: tuner0 tuning 107.1 WSPA (atsc3:599MHz-5004)
20250227-00:59:40 HTTP: rejecting request from 192.168.1.249 - no video data
20250227-00:59:40 Tuner: tuner0 http stream ended (requested time reached)
Twenty seconds later it tried again, and it succeeded. Since this appears to be something going on with the Silicon Dust tuning, I logged a ticket with Silicon Dust for this one, rather than to bother Channels (yet). And, for the record, yes, recordings for this channel do have audio (when they record at all).
I'm using these two ATSC 3 channels because I cannot reliably get their ATSC 1 channels (WSPA is a sometimes thing, WLOS is a no show) and there's no DRM on these (yet). The other two ATSC 3 channels (NBC and FOX) do have DRM. The tower from which all four ATSC 3 channels come is only 8 miles away.