Artnet and DP2000 problems

Hey guys, I've got a really weird problem here and I'm hoping someone clever can help me!

I'm using a DP2000 in artnet mode to receive Artnet from H4, it all works fine when the DP is receiving universes 1-4 sequentially however if I change the outputs to 1-0, 2-1, 3-0, 4-3 it looses artnet connection until I change it back.

Does anyone have any ideas what could be going on?