The bolt spring might be worn out.
The gold spring will work in all instances, and is probably the one you need for lower velocities such as those used in indoor play. The red and grey springs require higher chamber pressure and will only allow the gun to shoot at higher velocities. The red springs are ideal for shooting above 280fps. Grey springs tend to shoot higher than that but allow you to clip one end to better tune the velocity parameters at which the level 10 works.
Check to see if there are any level 10 shims installed in your level 10 setup now. If there are, take them out. They can cause intermittent leaks.
The level 10 bolt won't use the older spacer kits. You need carriers. You should have a carrier set ranging from 0 to 1.5 in order to guarantee proper oring tension settings in your level 10 if you ever have to change the white powertube carrier oring.
Except for the Automag in front, its usually the man behind the equipment that counts.