Hi @MiCoHi.
Thanks for reaching out and welcome to the community!
I appreciate your detailed post outlining the issue and your effort in submitting the diagnostic, let me help and try to figure this out.
Upon checking the diagnostic report, symptoms indicative of interference have been detected on one or more Sonos components running on your network. Quite possible that this is due to poor network connectivity to the device serving the music or wireless interference. You may refer to this article that will help you reduce wireless interference around your Sonos products.
If the above advice was followed and the issue persists, please submit a new diagnostic report through the Sonos app and provide us with the confirmation number, so I can see if there’s anything else causing this issue.
Let us know how it goes and if you have any questions feel free to reach out, we’re always here to help.