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@Mikenetic
Does the cassette freewheel OK on the axle when it's not in the frame, or if you attempt to make it freewheel by stopping the cassette does it still lock up? Have you tried removing the cassette & inserting the wheel into the frame & tightening to see if the freehub is still jamming?
Internet is suggesting a couple of potential causes:
Seized bearing inside the freehub boy, jamming the axle and freehub together [ame="http://forums.mtbr.com/showthread.php?t=472919"]DT Swiss 370 Info - Mountain Bike Review[/ame]
Crushing an aluminium spacer (if it's similar construction to other DT Swiss Hubs) [ame="http://www.ridemonkey.com/forums/showthread.php?t=237147#post3535222"]DT Swiss rear hub not free wheeling. - Ridemonkey.com[/ame]
There are a few things other things I can think of that might cause it, but none of them are particularly common.
Dirt/contamination/nasty broken stuff in the freehub body that is somehow stopping the pawls from retracting
Something jammed/wrapped around the freehub between the cassette and the spokes, which might be fouling them (hence the suggestion to take off the cassette)
Finally, a really bizarre one might be a broken axle? Sounds weird, but I was checking over a guy's bike who had a wobbly rear wheel, and the axle had actually snapped right in the middle. Only the QR skewer was keeping the cones (in his case) and everything in place. In your case the QR might be compressing everything up so much it's exerting lateral pressure, clamping down on the bearings. The wheel itself wouldn't spin well in that case, though.
Regardless, if you suspect the wheel might spontaneously and randomly convert itself into a fixed, rather than a free, wheel, I wouldn't ride it. That could get pretty nasty.