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My first thought was the same as Richard – phantom power being suddenly engaged would cause all manor of nasty noise & feedback – go through your scenes and make sure you don’t have phantom engaged or disengaged somewhere without muting (check every channel! I had a noise issue with my system which ended up being an open channel with no signal but lots of gain running to my auxillaries), it seems a more likely cause to your problem than a network error.

iDR32 mixrack
MixRack for iPad & Tweak for iPhone apps
Asus N61 Laptop (x2 wireless)
Windows 7 Pro 64bit
with Belkin PlayMax N600 HD router
Sennheiser IEM (for PFL)
Dante card