Over many months, I've gone through two TiVo Roamios, 6+ Cable Cards and dozens of technicians from Comcast & TiVo with the only constant result being that about 50% of the channels get a "Not authorized" or "V58" error because my Roamio can't consistently stay authorized with Comcast. Wish I would have found this thread months ago as it likely would have saved a ton of aggravation and its beyond me why the TiVo & Comcast technicians have been so incredibly ineffective at helping me solve this problem. At least half of the calls I've made to either company have ended up in a dead end of TiVo blaming Comcast or Comcast blaming TiVo. I've been taken down so many wild goose chases searching for problems that don't exist only to have it revealed fairly recently that its likely the Cablecard Firmware that's the culprit (thus finding this thread). Over 6 Cable Cards (Scientific Atlanta) from 2012 and before, running PKEY1.5.2_F.p.1401, the results have been consistently bad. Calling Comcast and asking for updates to Firmware have been next to useless - results have included them giving me TiVo's number (TiVo can't update the firmware) to saying they are sending an update and that it will take 30+ minutes to take effect...and then having absolutely nothing happen. Today, I picked up a card from the local Comcast Service Center that is dated November 2013, so hopefully this one will have a newer / updated firmware and yield a better result.