Firstly I'd like to offer a warm welcome to the forums, it's always great to see some new faces. I'm really sorry to hear that you've had some issues with your TiVo® recently and I'd love to help you out.
I've run some checks on your TiVo® and can see that all appears to be fine at the moment, all the signal levels seem to be spot on. So hopefully everything is fine for you now.
Should you still be experiencing any issues, please let me know and I'll look into things further for you.