Yes, I am a bonehead!
I took my first ski trip in about 13 years and turned off the heat just like I turn off the AC in the summer. When I got home the inside temp in my place was 40 degrees!
Now that my the subject of my intelligence/common sense (or lack thereof) is out of the way, here's what I noticed:
When I turned on my TV both my Series 2 and Premiere were extremely slow to respond to the commands from my remote. I had to push the button on my remote a little harder before I saw that the lights on the front of the TiVo's respond to the remote's command. Once the inside temp started to reach a comfortable 50-something degrees(!) both TiVos started to respond normally.
Does cold temperature affect TiVo's functionality?