Need CB Tech support

Hi, All, that use CB, we have just moved house and have moved to the NBN, and the speed is so much faster than our old system 477.3 Mbps Download and 35.7 Mbps upload but it has made CB glitchy and sometimes a Black stream and pixelate to the max. We have to run it off our old Wi-Fi and it works better, not as good as the old house, any ideas???