Dunno your situation, but at this point you need to go into serious troubleshooting mode.
Remove ALL devices (cable modems, splitters, VCRs, etc) between your "in from the street" cable feed and your cable box. Any place where there was a device, insert a F-F barrel connector. If you still have the problem, it's definitely a cable or box issue. If it goes away, you need to resolve the problem yourself.
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