Hi everyone,

I’m running into an issue with my Behringer X32 Compact connected to my PC via the X-USB card. My setup is:

Inputs on X32:
Channels 1–8 = local mic inputs
Channels 9–16 = more local inputs (talkback, etc.)
Channels 17–24 = USB card inputs (vMix return audio, Windows audio, etc.)
Outputs:
Aux Out 1 = studio monitors (Bus 1)
Aux Out 2 = in-ear monitors (Bus 2)
XLR Out 7–8 = control room monitors (Master L/R)
Routing to PC (Card Out):
Card 1–2 = Previously used for Windows playback, now disabled (Windows sounds routed locally via XLR)
Card 3–4 = vMix Master return
Card 5–6 = vMix Bus A return
Card 7–8 = Vmix Headphone return
In vMix:
Master Out → USB OUT 3–4
Bus A → USB OUT 5–6
Headphones → USB OUT 7–8
OBS:
I use OBS for streaming only, not for audio mixing. The audio comes from vMix into OBS, no mics or devices are selected directly in OBS.
Everything works fine at first, but after some time, the audio from vMix suddenly disappears. The signal from my microphones (sent to vMix) is still present, but I no longer hear any return audio from vMix or Windows (e.g., YouTube, videos). The only way to temporarily fix it is to unplug and replug the USB cable or restart vMix, but the problem reoccurs after a while.

This happens both when I select the X-USB ASIO driver in vMix, and when I select the regular WDM/DirectSound device.

Things I’ve already tried:

Disabled USB selective suspend / power saving in Windows
Checked sample rate (locked to 48kHz everywhere)
Tried multiple USB ports and cables
Reduced vMix outputs to just Master (3–4) for testing — still happened
Tried routing Windows audio separately (not through vMix)
Also tested with Voicemeeter as an intermediate driver, but the audio still cuts out
Has anyone else experienced this with the X32/X-USB and Windows? Is this a driver bug, or am I missing something in the routing? Any reliable workaround (Voicemeeter, ASIO4ALL, etc.) that would keep the audio stable without these dropouts?

Thanks in advance for any advice!