Some people have experienced GC autosamplers breaking vials. This can be caused by using syringe needles that are too long.
Some users have found that their Hamilton model 701 syringes seemed like they would work OK, but they had fixed needles that were 7 mm too long, leading to vial breakage.
Agilent autosamplers require syringes with 43 mm needles. Switching to Agilent syringes fixes the problem.