Following this...
Having the same issue with 8 Line6 XD-V75's. A year of trouble free use then issues suddenly.
We are working on a solution with our xFinity provider - we think our issues started when we switched to xFinity. We can turn our 2.4 off, but xFinity still broadcasts their generic xFinity signal and it appears that we have to call them and have them shut off the 2.4 transmission.