Stitching coming off

I bought these pants in october 2012. I use it for my workouts (3times a week for 2-3 hours) and hardly at other times. After only 3 months the stitching is coming off. I had used an adidas pant earlier which was really good and lasted for a long time, but this one was not up to expectations.Sizing and material was excellent, but with the stitching coming off I don't know how long are these pants going to last.