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I also see a similar behavior. I think that ROS cannot find where the nodes are if there are multiple Domain Name Servers (DNS). In my set-up, I have one on the ROS network, and one from my company, which "appears" only when I connect to the WLAN.

One solution could be to hard-code your computer names and IPs in the /etc/hosts file, which can be annoying to maintain. But give it a try in your setup, who knows!