Cox Gigablast - Video buffering issues

I have been with Cox Gigablast for 3-4 months now. I am getting poor video streaming quality compared to what I used to receive when I was on their Preferred plan (30mbps). I have tried this on several websites that we have been using for 8+ years and all the buffering issues have cropped up since we installed GigaBlast :(

I have tried this on connected-mode and in wireless. I just had a better experience with CoxInternet when I was on CoAx ..

The speeds are in excess of 700Mbps upload and download when I do the Internet speedtest with Fiber. But the constant "bufferring" during video playback is very annoying. It defies common sense. Anyone facing this issue and have any suggestions?