The mount on the DAB201 has a slight wedge shape on the suction part of the mount. It's meant to cause a tight friction fit. If you insert it backward and force it in, it could possibly cause the cracking issue. Unfortunately the manual doesn't mention this.
I watched Andrew from cam central's video comparing the Ausdom and the dome, he did mention the wedge shape and the fact that its only suppose to fit in one way, I took note of that prior to mounting the camera so that couldnt have been the reason why these things are failing.