I have three TRS systems programed into my 996t in 800 Mhz, 500 Mhz, and 400 Mhz bands. My problem is that the 500 and 400 systems keep trying to use the 800 system for a control channel (the stronger signal of the three) causing the other two be inoperative. I have all three sites programed into three totally different systems. I have tried control channel only on and off. Do I have something set somewhere that I should not. How do I not run these three sites together.