I've been working on a launcher to get 5 OJ tanks (one central, and four radially mounted) worth of fuel into orbit, and I've accomplished it, except that one (radially mounted), and only one tank persistently falls off. There is next to zero shudder or shake in the ship when it happens. Only the middle engine has gimbal on, and everything is symmetric. The entire structure is linked with struts in such a method as to prevent any oscillation. The tank that persistently falls off is only on one side of the ship, and falls off later in the launch, when nearing space (I've seen when the struts break), which is odd because all the engines are turned <66% maximum power to prevent overheating, unlike the rather violent takeoff. It's as if the connection and all the struts for that one tank only just say "I'm done" and break. None of the other tanks fall off, no matter how much stress I put them under. I'm sure there's no way to fix this, it has to be in the engine, but are there any other tips and tricks to keep parts from falling off like this?