While it is likely just inseam failure from the stitches (rather than the gemming separating from the insole), it is still something that Alden should be responsible for. The stitches are sealed inside the shoe between the outsole and insole (and surrounded by cork). There isn't much you can do to make those come loose, short of wearing the boots out to the point that they get destroyed by contact with the ground after the sole wears out. Thus, on a newish boot, it should be considered a manufacturing defect.
Either way, the stitches have to be coming loose, because if only the gemming were failing, you probably wouldn't realize it until the boots were sent in for resoling. In other words, it's either the gemming AND the stitches, or it's just the stitches themselves. Not just the gemming alone.
I just sent them an email, and reffered to the last time it happened and attached a couple of pictures. The last time I had the same problem with my other pair I took them to my local cobbler(he's and Alden dealer and regarded as the best in Norway) he wouldn't do it(it would cost me too much) and said I would be best off sending them to Alden. He said this type of defect should happen, as well!