I experienced this … had in the issue back in 2019, as did others who discussed in this thread:
It is an issue with the firmware on the MuSo gen v.1.
Try performing a firmware update on the MuSo (access the MuSo via a web browser, just type the IP network address in your browser. You will see “Network”, “Overview” and “Update”, choose “Update”).
Back in 2019 I had to actually contact Naim support to get the correct firmware software as it was “experimental” at the time … though it did fix it.