TsMkLg068426
macrumors 68000
If you have comcast as you ISP then they throttle other streaming services like netflix. I saw something the other day about how netflix is going to start paying them for higher speeds.
Most likely this is what is happening and netflix then downgrades the performance to SD since HD would then stutter too much
I have Charter Communications they are not any better so I would not be shocked they are probably playing the same game like Comcast.