When you say ‘fast internet speed’, are you talking about the pipe from your system to the outside world, or the speed between your speakers and your router? In most cases of ‘stuttering’, it’s the latter, not the former. Two very different things.

I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it, or post the diagnostic number here for a Community Moderator to pick up.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the phone folks, there are more options available beyond just the diagnostic analysis.