XVive Wireless System U2 Black

I was looking for a nice and easy to use wireless system, and that's exactly what I got, the Xvive works great and has an amazing range and no delay. I tested it out on big festival stages this summer. and used it at practice. but here comes the HUGE problem. Xvive has 4 channels meaning on paper you could be 4 people with the Xvive on the same stage at the same time, each on one of the 4 channels. but me and my band mates all had this system, and when we walk across the stage and pass each others guitar/bass amps, it cuts out the sounds for a split second. and this happens all the time. basically what I'm saying is that there can only be one Xvive system on stage for it to work properly...