Door Flies Open

[Diastole]

I have an early '30 Coupe. In decent shape

When I drive her, the drivers door latch gives way, and the leaves the striker plate and catches on the body. Then with the next bump the door flies open, particularly if I am turning right.

Both the striker plat and the lath had wear.

I changed the door latch mechanism with a new one from a parts supplier. No change in action.

I replaced the striker plate. Slight improvement, but problem still existed.

I ground a flat spot onto latch and I had a dramatic improvement, but the door will still fly open if I drive long enough.

Please help. Any suggestions?

Diastole