[dadndave]

Have cracked two screens over last 5 years in nearly the same position. First occurred without windscreen brace, being driven on a typical NSW road, roughly patched etc. The second time was at Eastern Creek over Easter and have had a centre braced installed after the first break. The racetrack is smooth, no potholes, patches etc, and didn't jump the ripple strips.
I can only put it down to body flex. Good thing is I always get a free new one - thanks to Shannons.