My Series 2 Tivo has been working fine for over a year. Then suddenly I cannot turn it on unless I unplug the power chord then plug it back in. It will then work for a day or 2. Then it happens again. Also, it won't record when it's in the not powering on mode, until I have unplugged it from the power outlet and re-plugged. So, I have no idea when it goes off or on and costantly needs to unplug and plug... Any idea what is wrong and more importantly, how to fix this? Thanks!