Like the title says, I get a low screeching sound every 230 seconds on a Dragonfly Black 1.5 USB DAC when playing music from any source using ShairPlay, Shairport-Sync, or MPC over alsa. A cheap 16 bit DAC I also use does not have this problem. Before I upgraded to 19.07.4 from 19.07.2 the noise was happening every 60 seconds.
Any ideas on how on how to further debug this? I watched Top and don't see anything usual when the static happens. I think I read there may be some USB issue with the WNDR4300, but it seems like some process must be doing a lot of interrupts periodically or something.
The 16 bit DAC sounds ok, but I have some higher def music I want to stream also. I have another higher resolution DAC that doesn't have the issue either.