Not sure really!
I was running two switches, three Art-Net Nodes, one Wi-Fi AP, one Stream Deck, and a local laptop networked in for running ZerOS Monitor.
Vari-Lite email support could only offer the suggestion that it would have been due to an unstable network. There could be some mileage in that as my laptop did occasionally drop connection to ZerOS Monitor.
Anyway, its all over and done with now, I never ran them in tracking, however was ready to rapidly connect in the backup ethernet cable if my primary desk crashed during a show, which it didn't (hooray!)
Pic for prosperity - stuck at the back of the box behind the venue desks - main sound FOH, running audio feeds into venue mixer