Put Connex 330hp with monkeymade antenna on a 2013 cascading. Bought mirror screw bracket for door mounting. Radio randomly keys up and sticks. Checked swr’s and was high. Couldn’t get them down on door. Moved to top of headache rack with antenna 6 inches above cab. Swr’s are below 1.5 but still same problem. Does it parked, moving, and if someone is near and transmits. To un stick I key the mic or turn radio off and back on. Few times when turning back on it keys and sticks in a few seconds. I did run ground from bracket bolt to frame of truck. Also there’s a factory installed inverter that runs power to a fridge constant. Any help greatly appreciated