Crown thread.

My thread for crown on my Dive Watch case is not durable. Once customer service already sent me a new case and now I feel there is some threads are damaged already on a new one too. When I screw crown down it takes less revolvings than it was before.
Did someboy experienced something like this?

Maybe your crown stem is too long and the crown cannot grab enough threads on the case.

Thanks ModHatter for the suggestion…The thing is it was required to make more crown revolvings for the full traction before than it now.