We got a new Tivo box from Virgin a couple of weeks ago and get this problem constantly with Netflix buffering at 25%. We called Virgin 3 times last week and were on the phone for TWO HOURS to them yesterday. Even set up a brand new Netflix account and still having the same problem. I then found your response online which was so helpful, but am somewhat dismayed that your post is from nearly two years ago and this problem still persists. Any further info you can offer (so I can then tell Virgin, who should obviously helping me, not the other way around grrrrrr!)
Right listen in. After listening to VM's totally incompetent laughingly named customer service, hours on the phone to VM, and hours on hold the answer is simple. Some TIVO boxes are duff, plain and simple. After a month of pestering VM one of their Indian call centre guys spelled it all out to me and advised me to replace TIVO with V6. I did and the problem has gone. Why they couldn't have told me this a month ago and avoided a lot of frustration and anger I don't know but there it is, forget filters, cables, workrounds etc, some of their TIVO boxes are duff.
I now believe the problem is with Netflix...I now have a youview by box and the problem happens with it...the diagnostics showed the internet connection was operational but the 4 Netflix servers could not be connected to.
Well, I'm confirming it doesn't always work on my bt youview+ box. Once it happened several times within an hour and I found my usual fixes didn't work I.e. restarting Netflix App, youview box ...and finally restarted router box...hadn't Rebooted that in weeks and it could be errors on the line gradually decreased operational speed to lower than Netflix requires...after router reboot..did not see the Netflix problem resurface for days.