My DVR no longer allows me to "rewind" when I flip back to my last channel? Fios used to auto record the previous channel so if I changed channels back to the last channel it was auto recording so I would be able to rewind. One example is if I am watching 2 football games on different channels. If I miss a touchdown on the other game because I had flipped to the primary game I can go back to the other channel and still rewind. This capability which I have had for years does not seem to be working. Does anyone have any idea why or how to fix?