From another user:
Looks like your network connection is flaky (if it is only this ChromeCast device and the others are well). For the last user reporting this, it was a bad network cable or the wall-wart power and Ethernet adapter. If you use WiFi try a wired connection instead.
As far as I’m aware of, this points to issues with(in) your network and not Roon. Roon is a victim and just shows the resulting mess.