Check the front-left of your TiVo for flashing green lights (the heartbeat one especially) that would indicate a failed (inbuilt) net connection. That's a fault if so.
If other streaming is ok and you're not getting the flashing light, it may potentially be that you need to consider swapping to a V6 which runs the same software but is a much newer box and is a lot better at running all the streaming apps.
You'll need to have VM broadband to consider going this route, but it would certainly be an improvement.
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