I’d suggest some sort of network issue, causing the speakers to temporarily disconnect and reconnect to the signal.
Given the lack of any information in your post beyond the simple fact that it’s disconnecting, I’d suggest both reading the wifi interference FAQ, and performing a relatively simple refresh of your network. This can be accomplished by unplugging all Sonos devices from power, and while they’re unplugged, rebooting your router. Once the router comes back up, plug in your Sonos devices to power again. Wait a few minutes for the system to finish loading, and then test.