I'm sorry to hear that you're having issues with viewing Netflix through your TiVo. Apologies also for the delay in getting back to you.
I've run some testing on your TiVo, and can see that there are a few power level issues which will in turn affect the speed of the internal modem - which provides the connection for Netflix.
So at this point, we'd like to look at booking a technician to call out and take a look. I've sent you a private message in order to get the ball rolling, please look to the top right of this page where you'll see a purple envelope icon, click on this and you'll see my message.