ya, it's not a tuner issue.....something about History HD channel or the transponder it's on maybe that is causing the problem. I stopped the recording of Pawn Stars, rebooted the receiver, and tuned to 310, and hit record. Then tuned to 314 and all is fine, both tuners working.
Then stop recording 310, tune to 365 (History HD), hit record and tune back to 314.......and even though now both tuner lights are on in the front, and system status says both are now fine, 314 is black.
I've gone through this cycle with a number of other channels now, and it's only History HD that once I hit record on, really bungs the whole system and the tuners up..........weird.
I'm on hold with SD to see if this is a known issue, but of course been on hold for over an hour now. No call back option.........