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The 3560 is one of the better tuners available for pulling in weak stations. It could be that your signal is actually too strong and causing the problems you're seeing. Try inserting an attenuator in the line and see if that helps. You could also use one or more splitters if you have them onhand. Just make sure you place a 75-ohm terminator on any unused ports.

I had similar issues on certain local channels but was able to switch to another affiliate further away that had a weaker signal. The problems disappeared immediately. I'm in between Baltimore and DC and get all of the networks for both markets. The Baltimore NBC station is only about 10 miles away and was having the same problem you described. The Washington NBC station is about 30-35 miles away and had none of the issues that the Baltimore station did. I found this strange because the Baltimore CBS, ABC, and Fox affiliates all broadcast from the exact same location (ABC, CBS, and NBC all use the same tower) and none of the other channels have issues. I can only guess that the NBC station has a more powerful transmitter than the other three channels.

BTW, I'm using six 3560's in my HTPC and like them better than the Hauppauge HVR-2250, HVR-950, OnAir USB HDTV-GT, and the HDHomeRun. I've tried them all but keep coming back to the VBox tuners.