Then you must have a pretty old version of Docker or maybe one installed as a Snap package.
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I neved worked with sound devices from Docker containers, but I would start with checking system logs and docker daemon logs. For system logs, I would try journalctl command and/or syslog under /var/log and also the dmesg.command.
but I don’t really know why you would lose a device and even if it happens because of a Docker bug, i you have an old version, that will not be fixed