this exact thing happened to me after about 200km with these wheels, they fixed it under warranty really fast but I’ve noticed the back wheel driving the cranks a little bit after another 100km so I worry it’s starting to seize again – it almost took the rear mech off the first time I freewheeled after it seized so I’m a bit hesitant to ride it now, don’t want to get stuck 20 miles from home with no freewheel
they told me it was a bad batch of spacers inside the freehub that were a fraction of a mm too big, though I don’t really understand why it was spinning fine at first and then seized up after a while
would be interesting to hear how many people have had a similar problem with the wheel, it sounded like they had to fix a fair few of them already before mine