I have Sonos Amp, but also have the problem on an old Connect:Amp. Both are wired, not WiFi. I listen to TuneIn radio.
The problem is that playback begins to stutter after an hour or two of playing. The music cuts in and out repeatedly.
I'm able to resolve the problem by stopping play, then starting again. The same feed no longer stutters for a long while after restarting. But this used not to happen.