My band has 4 G10s and a Behringer XR16 as well as a bunch of smart phones and tablets between us. We have played venues within range of a half-dozen WiFi access points and in front of crowds possessing dozens of smart phones, tablets, etc.
So far, the only issues we've had are a transmitter not linking up with it's base after waking up from sleep mode, and with a transmitter connecting to the wrong base after waking up from sleep. But these cases have been rare. So long as the transmitter is awake and it's linked up to its base, we've never had a problem with audio quality, pops, clicks, dropouts, etc.