keeps freezing or I lose sound,

I have the same problem during wireless 4k playback - the video freezes or sound drops out. One occasion the video froze completely and I had to exit to the guide. 
i have reset the wireless 4k contour by unplugging and also reset the  wireless panoramic WiFi router. Neither reset fixes the problem. Connection to Cox coaxial is fine as most live video is ok, but still freezes momentarily on occasion. I’m guessing Cox doesn’t have the bandwidth they claim regularly- the hiccups are enough to cause these deviations.