Ok, then its probably a problem with the leaf spring. When it is not in correctly, it prevents the trigger from resetting correctly if the trigger is still pressed when the slide moves and avtivates the disconector. You can remove the pin at the bottom of the grip and slide out the hammer spring chamber. This will allow you to access the leaf spring, remove it, make sure there's no garbage in there, and put the leaf spring back in. The leaf spring must be on top of the two "tab" things, the thrid arm is for the handle safety. Put the hammer spring chamber back on, you'll have to press hard to compress the spring. Try to shoot again. If it goes full auto you did something wrong, if it does the same thing, you might have to bend one of the arms of the leaf spring a bit, but that's material for another post.
Keep quiet. Sound travels faster than BBs.
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