internet connection

Dear Cox,

Why is my internet connection so slow now - I have double and triple checked my modem/router and computer, the issue is not on my end,;this same computer works wonderfully with streaming when I am in hotels, at work or even the airport, but at home the buffering goes on steadily and often making it impossible to watch streaming films etc at home.

I suspect that you are making me buy an new and more expensive product - if so, tell me what.