Audio breaking up at start of music

Hi @GaryLuton1010, welcome to the Sonos community. Thank you for letting us know about your concern and for providing the diagnostic report. Let me help you out with this.

Based on the diagnostic, there's interference in your wireless network that is caused by wireless congestion, audio dropout due to sync error, and your Playbar was detected as a dropped room in your Sonos system. 

To help you with this, let me suggest the next troubleshooting steps, to perform a sequential reboot of your network devices, all your Sonos products, and force close mobile controllers to refresh the connection. 

A sequential reboot means that we need to do this in order.
1. Unplug your network devices (modem, router, any wireless access points on the network) from the power and wait for 60 full seconds before you plug it back in.
2. Once the router is back online, unplug all your Sonos devices from the power. Please wait 15 seconds before you plug back them back in.
3. Force close the Sonos app from your iOS or Android device.
4. When the status light on your Sonos speakers are solid white, get back on the Sonos app and check if you're connected.

If you're still having the same issue, remove and re-add your Sonos Amp as surrounds.

Please run a diagnostic from your Sonos system and reply back with the confirmation number to check. If you need help with any other information, please be sure to let us know.