Every channel is tunable. For some reason though, channels with higher numbers when tuned, will cause the other three tuners to show the v58 error for the channel they are tuned to. They are definitely in the 350+ channel numbers, and not all of them cause it, but most do, I haven't found a pattern yet. So if I watch one of the channels with higher numbers, I'm essentially down to one tuner and can't record anything while I'm watching that tuner. If I'm watching a tuner and one of the other tuners switches to one of the higher channels to record something, the tuner I'm watching freezes and eventually shows the V58 error. I've read what seems like a million threads about v58 errors and haven't seen this variation of the problem. I'm on my third cable card, and have had a tech out for the third card. I would see this error intermittently at first, but now it's easy to reproduce any time. I've tried attenuators to no avail. Tivo Bolt. Spectrum cable. Pretty frustrated at this point. Any help would be great.