Advise on intermittent mmc1/wifi issue interfering with audio playback on raspberry pi 4B

I have configured raspberry pi 4B to be an audio processing device. I load headless Ardour (DAW) audio sessions and play them back. It works perfectly 95%+ of the time, but every once in a while a newly-loaded session will produce xruns in the audio every 2.7 seconds. That is, I can load the same session dozens of times and then on the Xth time, it'll have xruns. If I reload the session, the issue resolves. The source of the xruns seems to be I/O to the wifi controller, via mmc1. dmesg: [75875.900361] mmc1: Got command interrupt 0x00000001 even though no command operation was in progress. I'm looking for a low-level interrupt expert, especially with Raspberry Pi 4B, to tell me (a) what is going on and (b) how to fix it. Is it a kernel patch? Is it some other workaround? At this point, I'm not looking for hands-on help. I'm really looking for someone who has seen this before (and/or fully understands this) and can say "oh yeah that's happening because X. You need to do Y or Z to resolve it." If that's you and you already know the answer (and I can verify it)... that's an easy $500. I'm happy to provide more information on request. If this is going to require more hands-on investigation, I'll cross that bridge later. Right now, I'm hoping someone knows what to do, practically off the top of their head.