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Do you split your cable at the wall to the TV and modem? For the longest time I had the same issue. It turned out it was a bad splitter. Everything worked just fine when I went straight from the wall to the modem and then later bought a better splitter.
However, after some time (about a year), the second splitter crapped out on me. I'm on my third now. It's annoying but at least I know what to check before I flip out at the cable co.
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