I'm having similar problems. Netflix and Amazon Prime have always been fine. I can watch them even if I'm out of data, with only a little buffering. STARZ, however, will only play for about two minutes, and then need to buffer. This happens even if I have plenty of data. I wonder if the wifi booster would help this issue. I do not have that. But it seems like it's more for extending the area of the coverage, not making it smoother. The TV where I'm having these problems is right beside the router.
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