Hi!
I have had this problem for a long time (12 months+, too much other stuff going on ;) ). It surfaced after switching internet provider. To narrow down the problem, I have only CAT-connected SONOS devices on my network now, one Connect and one Connect Amp. I focus on testing with Spotify-content streamed.
I have shared my diagnostics just now, reference 619172540. Help is very much appreciated!
Best,
Haakon