Firstly I'd like to welcome you to the forums and say that I'm really sorry to hear that you've been having issues with your TiVo® for some time, and that on Monday you lost all connection.
I've done some investigations my end, and can see that on Monday night we were experiencing an issue in your area that would have meant that your TiVo® may have been struggling. This was restored in the early hours of Tuesday morning. When I check your TiVo® now it's showing that it's online and currently tuned in to a channel. However I do see some issues with one of the input levels, which may explain why you've been experiencing issues in the past, so I'd like to arrange for a technician to call out and investigate further for you.
I'll send you a private message in order to get things moving with this, 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.