One of the issues I had, and by the look of it several other have, is that when you first turn the tv on in the morning (after its been off for a few hours) you just get a black screen. You then have to change source and then change back to the V6 to get a picture. This is a Samsung issue, not a V6 issue, after the last firmware update (1160). To solve it, change source to TV, then in the tv settings menu go to Broadcasting, Autotuning and turn off Autotuning. Worked for me
I also had this problem with a KS9000. I spoke to Samsung Customer Services and they ran me through the fix over the phone. First unplug the TV from the mains wait for 20 seconds then plug it back in, go into the settings and do a factory reset this will reset the TV to the way it was when it came out of the box.