I purchased my Roamio Plus in mid-September and had many problems with channels intermittently dropping out, resulting in an error "v58". TiVo technical support informed me that this was often the case for South Florida Comcast customers, as the cablecard firmware needs to be upgraded, system wide, to a version higher than 1.5.2. They had no timetable as to when this might occur. Ready to send my new Tivo back for a refund, the Comcast tech (who had already been scheduled) called, and told me he'd had luck with Premier owners encountering problems, by upgrading the firmware to their newest version (1.5.2-FP2401), which was higher than what was on my cablecard. I kept the appointment, and after the upgrade and a hard reboot of the Roamio, things were working fine, with all six tuners. As of 10/30/13, however, the vast majority of channels (both SD, HD, and Pay) are not available and display the v58 error. I've had Comcast un-pair and re-pair the card several times, and refresh the signal, without resolution. TiVo tech support also spent about 45 minutes with me, checking signal strength, noise, and many other issues, determining my Roamio is working fine. I spoke to the Comcast tech who did the Firmware upgrade for me back in September, and he told me he's heard from one other Roamio owner in the area who also is suddenly having problems. He doesn't believe that whatever has happened at Comcast has affected Premiere owners.