The TiVo is fundamentally an old box which does struggle with many of the current streaming apps - one of several reasons why many apps are now only the V6 box.
Having said that, many issues with streaming on the TiVo are caused by a failed/failing internet connection which is a fault - do you have any flashing lights on the front-left of your box?
If you've had your package a while, you may well be able to get a half-decent deal on swapping to a V6 box.
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