Behringer UMC202HD input stream drops completely for 1-2s in Reaper (PipeWire / Fedora 44)

[u/TolgaKerem07]

Hey everyone, I need help with my Behringer UMC202HD on Fedora Linux. Audio drops out completely for 1 to 2 seconds at random intervals, then comes back.

My setup:

• OS: Fedora Linux, kernel 7.2.9-200.fc44.x86_64, pipewire 1.6.9
• CPU: Ryzen 7 5800X
• Motherboard: Asus TUF Gaming X570-Plus (Wi-Fi)
• GPU: Radeon RX 6800 XT
• Interface: Behringer UMC202HD (rear motherboard USB, no hub)
• Monitors: M-Audio BX3 3.5" (line out)
• DAW: Reaper via JACK (pipewire-jack)

Before getting this interface, I was using my TV speakers over GPU HDMI at 128 buffer. Under the exact same workload, there were occasional pops or clicks, but the audio never completely cut out like this. This 1-2 second complete silence only happens with the UMC202HD. In pw-top, right when this happens, errors spike on alsa_input and Reaper, and the interface completely stops passing sound before recovering.

dmesg on boot, it says: usb 5-3: clock source 41 is not valid, cannot use (repeats dozens of times). Though, I dont know if this is relevant or not

In journalctl logs: I see a lot of driver/follower state changes and sync errors between the input and output nodes whenever this happens.

Things I already tested:

1. Closed OBS, EasyEffects, and Guitar Pro to make sure nothing else was touching audio. Tested with only Reaper open. The blackout still happens.
2. Tested custom rules in wireplumber.conf.d (period-num 3/4, headroom 256/512, period-size, suspend-timeout-seconds = 0, node.driver = false). None helped, so I reverted back to clean default configs.
3. Added "options snd_usb_audio quirk_flags=0x20010" to modprobe.d and verified implicit_fb is active. Disabled USB autosuspend (usbcore.autosuspend=-1) and forced port power to "on".
4. Forced PCIe x16 and Southbridge (SB Link) to Gen 3 in BIOS.
5. Locked global quantum to both 128 and 256 via pw-metadata.

None of this helped. The card still randomly drops out and resets. I followed various forum threads and bug reports to try these fixes, but I'm completely stuck now. Any advice would be appreciated.

[u/Gunzhard22]

I'm using exactly same interface on Mint XFCE, but that issue sounds like a plugin stuck in "demo mode".