Just for info, been having issues of random stopping of playback with macOS Sequoia since Sequoia Beta 8 and the RC. Issues were associated with the network subsystem and problems with 3rd party security suites. Appears some late changes to the Sequoia networking subsystem has led to issues for quite a few people. For me, submitted a bug report as I logged a network error in Beta 8 that was causing AS to terminate playback, to be fair it is very infrequent. Seems they did not fix it even though the issue with packet errors was reported by many people. Link to article below, Apple is apparently aware of the issue and is working on a fix.
Symptoms for me are 1) Playback termination followed sometimes by, 2) subsequent loss of internet connection despite the internet connection being fine on all other devices connected on the network and in a worst case loss of UPnP devices from AS playback options and sometimes a crash of AS.
Pretty certain from network logs that macOS is the cause, have tried turning off macOS firewall as a suggested solution on forums however if it is your only firewall then probably not an advisable solution.
Maybe a good idea if you have not upgraded but are thinking of doing to hold off until 15.0.1 at least.