I just removed my wireless from my show tonight. Was getting random interference from other (outside) sources that was causing random flashes. This may not be an option for you guys, but I recommend trying a wired solution if you can.
The other thing to try to do is to orient the TX and RX the same way (vertically) as this maximizes the signal outward and inward (dependent on your point of view). Another issue may be if the TX is close to the Etherdongle or Lynx DMX Dongle. The recommended distance is 2 feet from these devices. Other things that can interfere with your wireless: Other wireless devices that include phones, house/private networks, bluetooth networks, etc. Try to find a universe (you have 3 to try) that is the 'cleanest'.
The connectors between the EX/RX and the Lynx Express are very sensitive. I have had instances where my EX/RX stopped working until I plugged it in tighter. Even then, it would cut out once in a while.
Kurt