I'm taking a guess, but it sounds like the motor's gear is spinning free, so the gun doesn't cycle and that's why it would spin forever even in semi, as it is the cycle that cuts the power to the motor. Did you try playing with the bolt located into the pistol grip?! This bolt adjusts the motor's height into the gearbox.
EDIT: I don't think blocked BBs in the barrel should make your gun do this, but did you try passing the unjamming rod anyway?
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