Buffering again

why is both sites buffering the shows? is it cause of being overly busy, time for kids tro be out of school and all. Is that it? I so much wanted to watch Legand of the blue sea and not able to watch cause of it buffering every 5-10 seconds. I cleared out my history, thought that would do it. But not so.oh yeah was wondering about the internet/cable, but don’t think thats the prob. any suggestions?