From what you have told me I would suspect the hiccup and the rumbling are TV related. Unless the incoming signal is being fed in the TIVO and then to the TV and then I woulds suspect the TIVO. Diagnosing problems without hands on can be difficult and intermittent problems are difficult with hands on. Without testing all I can provide is an educated guess. Please do not accept unless you are positive you are 100% satisfied with the information provided. Let me know if you would like me to opt out and have another expert assist you.
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Regards,
Edward
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