Sorry to hear about the problems you're experiencing with Netflix through your TiVo at the moment.
I've been able to run some tests on the set top box from our end and we're seeing some minor errors with the signal being received. This could be causing the issues with Netflix and other apps so I'd like to arrange for an engineer to take a closer look if you're available? It'll also help us make sure there aren't going to be issues in the future
I've sent you information regarding this in a private message, you can view it by clicking the red envelope on the top left of this page.