[LAU] jitsi-meet videoconferencing and jackd losing mic input

[Peter P.]

Hi,
for the last two years I was able to run the excellent and floss
jitsi-meet videoconferencing tool using the jack audio
server by installing the "jack" alsa plugin, and telling jitsi-meet to
use it as default via my ~/.asoundrc holding the following:

pcm.!default{
        type plug
        slave { pcm "jack" }
        hint {description" jack with software conversions added by me" }
}

Since the last two or three jitsi-meet upgrades (which are hard to trace because
they happen forcibly and in the background without user notification)
the software will lose its microphone input a few seconds after the mic is
unmuted, tracable by a vanishing audio connection in jack's gui
qjackctl. When this happens I see jackd posting

subgraph starting at alsa-jack.jackC.468772.0 timed out (subgraph_wait_fd=17, status = 0, state = Triggered, pollret = 0 revents = 0x0)
09:27:13.048 JACK connection graph change.
**** alsa_pcm: xrun of at least 393698.976 msecs
09:27:13.052 XRUN callback (8).
09:27:13.232 JACK connection change

How can I go about debugging this further? Thank you a lot!
P