Uh, interestingly enough that's EXACTLY what is said with the Spyders going wrong, in addition to the classic "spyder jam" that happens where a ball is chopped and lodged between the bolt face and the inside front of the body. When I ref rec games I see that and have to repair it CONSTANTLY.
For the benefit of your buddies, yourself, and the kind souls that repair guns on and off the field, STAY AWAY FROM SPYDERS. Get a Piranha or Tippmann 98, both of which are quite reputable and see few to no problems.