I just replaced my Roamio with an Edge. I expected that all the usual features and procedures would remain unchanged. But when I turn on the TV now, the usual 30-minute buffer for the channel Tivo was tuned to does not exist, I have checked every setting and preference and can find nowhere where that buffer could have been disabled or can be turned on. This is a serious problem for me, as I often fail to turn on the TV at the very start of a program on the channel Tivo was last tuned to; with the Raomio, I'd just go backward as far as necessary to find the program's start (as long as it wasn't more than 30 minutes ago, of course). Am I missing something? Is my Edge defective?