I’ve reposted this a few times. Try this:
I have run into this issue multiple times over the course of Sonos constantly updating their devices. First, restart your Roon server and see if that helps. Second, what I found was that this occurred consistently in devices that were once on the S1 software and updated to S2. Products released after the S2 switch that only came within S2 software don’t seem to have this issue.
The ‘fix’ I found for this is to go into the settings of each Sonos product within the Roon app and switch the bitrate from 24 bits (S2 allows for 24/48) to 16bit. Roon will then transcode down to 16 bits and you should be able to play without an issue.
You can look at my posts here, which details my ip trace(s): Playback issues on Sonos devices after recent update to S2 version 16 and Roon server version 1359 [Roon Investigating] - #48 by benjamin