Like all paintguns, the Spyder has its share of problems. I have written this little fix-it chart to help you diagnose and solve your problems. An expansion system or remote might help if the weather is cold. Some Spyders were even sent without them. Check it for damage or warped sections especially if you are using the stock barrel.
High velocities can cause ball breaks.
This is a common problem with most guns usually caused by a piece of a paintball getting wedged between the bolt and the inner wall of the gun. A broken o-ring could also cause this problem. Refer to the first problem for ball breaks. As for the bolt, I pour water down the gun to soften up the paintshell and then push back hard on the striker's knob. Some push against the screw in the middle of the bolt, but this requires caution.