So i just got a new Roamio Plus to upgrade from my TiVo HD. So I took the cable card from the THD and put it in my new Roamio and was starting to call my cable company when a picture came through. I checked a variety of channels in different packages to make sure every channel that could be coming through was. I then took it and put it back into the HD and it still worked just fine without needing to call the cable company to pair again. I thought cards needed to be paired and paired again when moved into a new device.