Hey guys, thanks for the help so far, here is a picture of my missile. first is the rocket attached, secondly after the rocket is fired with the 3 sepratrons stuck and then the third image is after the rest of the rocket rolls onto the ground and is destroyed and is the remaining sepratrons detach . In the images you can see the larger rocket which fires fine and the same missile on a different craft with no problems. like JPmAn said it is definitely a problem with the sepratrons because when I take them off the remainder of the missile detaches normally, but when I reattach them higher up without any offset they fail to work again.