When I’ve had this it’s because my original LogitechMediaServer started up. I finally stopped that from starting after a reboot. I’d try - 1 - double check any former logitech software is not running, 2 disable re-enable the Roon squeezebox settings mentioned above, 3 - power off for a few seconds, then on, the squeezebox endpoint. That always works for me. Make sure the squeezebox is not running in that mode where it connects to the logitech online service. Failing that, make sure it’s running a recent firmware and it’s on a solid network connection. Try cabled in rather than wifi?