We (
www.OCPC.co.uk) pulled our products from release for this very reason.
The Polycarbonate we use is 1/2" , and we still found problems with radial fractures.
The next test batch comming is from a different grade of Polycarbonate ( don't ask me what - this is down to plastics Engineers).
I too am concerned with this, hence why we never released publicly the neptunes. End of day we don't want our products doing this:
This is a development block , thats showing the symptoms you are all saying is effecting the maze3 too.