Of course, you should always be sure there is sufficient airflow around a device. But ‘very hot’ isn’t enough to know if there is an issue or not. All electronics generate heat of some amount while working, it’s the nature of physics. If you’re concerned, submit a diagnostic and call the Sonos folks, I suspect that operating temperature is part of the data within the diagnostic.
It’s possible, albeit unlikely, that the device is shutting down due to overheating, and then restarting the stream, but I suspect it’s much more likely that you’re having an issue with wifi interference of some type, and the CONNECT is losing connection to your network. When a CONNECT loses the connection temporarily, it does exhibit the behavior you’re seeing, so again, I’d recommend that you submit a system diagnostic within 10 minutes of experiencing one of these ‘stoppages’ , and call Sonos Support to discuss it.
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, they have tools at their disposal that will allow them to give you advice specific to your Sonos system and network.