I have three (3) Line 6 units...two (2) XD-V70 units and one (1) XD-V75 unit for my lead vocalist. All of the units are housed in a rack with other Sennheiser G300 Wireless systems. I use a Behringer X32 Digital Mixer that is accessed by an iPad through an ASUS RT-AC66U 802.11AC Gigabit Router.
I am experiencing frequent drop outs when using the V75 unit that has rendered it unusable. I have scanned channels, changed it from low to high power and back, moved the mixer and ASUS unit away from the stage to FOH 40-50 feet away and still it drops out. The rack holding the units is always less than 20 feet from the stage and the antennas are mounted on the front.