Contact Alpinestars and they will fix them as they are having problems with some. Mine are 2 years old (2000) and the soles are in great shape along with several of my friends that haven't had any type of problems with their Tech 8's.
If you run out of luck with Alpinestars, here is where Alpinestars's sends their boots for repair.
Sole Performance
Encinitas, Calif.
1-800-944-2755
Also I hear Freemont Boot Repair does a fantastic job on mx boot repair
124 Stewart
Freemont, MI 49412
616-924-0190