My new Roamio Pro is getting V53 errors for a lot of my channels. I've searched and I suspect this is a problem with my cable card or my Comcast signal. I've been on hold for TiVo support for 58 minutes, which is just ridiculous. Any suggestions on my next best option since TiVo isn't any help? I don't look forward to calling Comcast. Is a new cable card worth trying? Thanks.