I've got an old Duet, and for the first time I've had an issue with spinning. Late one night I tossed in a mixed load of dark clothes and went to bed. Some of the pants I hang dry and one or two of my shirts, the rest go in the dryer. The next morning I went to hang the pants and they seemed very wet, same with the shirts. Felt the rest of the load and decided it did not spin out, I had selected the high speed spin.
Set the machine to spic cycle and it hung up at the 6 minute mark, it tried to rebalance for I'd guess 5 minutes. Finally it did go into high speed spin, but it took a while. This was a sort of unusual load for me, but it should not have been for the machine. I don't usually do pants with shirts, and this time it was only 1 pant with a number of shirts, so it might have really thrown off the balance. who knows.
Anyway as to the new machine, I'd opt for a replacement this early in the game, it might just be one of those dreaded problematic machines that pop up and I bet the next one off the line is fine.