I'm sorry to hear that your On Demand isn't working and that you're getting this Network Cable is Unplugged message. I will be happy to help check this out for you.
I have had a look at your TiVo® remotely and all is showing online and signal levels are where they should be. How are things looking today? If you're still getting this error, please let me know and I can help further.
I'm here if you need me.
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