I've run diagnostics on your equipment and I've picked up an issue with your input signal levels that may be causing the issue. I've sent you a private message (purple envelope at the top right of your screen) so I can grab some details and get this sorted out for you.
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Just the same for me a week after we had a TiVo 6 installed - it’s so infuriating as they must know the truth but continue to say the same thing to people for years. So fed up - paid a subscription for years and have had the same issue despite numerous visits, tests and new equipment etc. Total waste of money Time to get an amazon fire stick I think.
I too am experiencing this error. Everything appears fine until the 25% buffering icon appears. It only occurs whilst watching Netflix. The error identifies a connection issue and appears to affect all Apps. However all basic channels operate fine and after a couple of minutes it is possible to reload Netflix. Speed tests reveal 80+Mb available of 100Mb service and PC and Amazon fire stick stream Netflix without this problem. Clearly the issue is with the TiVo hardware.