It would seem any time I leave sACN Output Viewer open and change tabs or have several open and move to another tab/screen those universes stop outputting, at least on my 4 Port Response Gateway. I have the last address of each universe parked at a value so nothing should ever stop transmitting.
This is probably an issue with the switches in the network, try turning off IGMP snooping
See forum threads below for background info
Thank you, I think it is, I thought I had looked it up before posting but apparently not.