[{HVY-E}Jinxx]

Starting with 4.10m, planes now have cumulative stress damage build up from excessive G load on the airframe.
You may have over stressed the airframe and not even known it.

Also aircraft, the F4U especially, will loose wings if you are at those speeds and push over slightly (negative G load) while in a dive.

Hope this helps you solve the issue.

S!