Hmmm, I've not had that problem with the MT2. I did have the bolts stripping out of the knuckle problem, and ended up buying alloy knuckles and then threadlocking the bolts in. Try flexing points on the arm to see where it gives. Somewhere the plastic is bending and allowing the dogbones to be ejected. I've done that with other trucks, and it's allowed me to find out why they're flexing. Good luck. Hopefully you'll find it.