It is possible that it is not top speed runs, but vibration multiplied by time causing metal fatigue and then failure. Of course, a larger windshield means more weight and more force on the parts... combine that with the above and the possibility of failure increases.
That may be the case, but my huge C Baily has been on for >90,000 miles, has been off-roaded, bridge blasted, and hit every pot hole between Montreal and Los Angeles, and hasn't given up. Of course it may tomorrow.... but so far so good. I think its a quality issue.
'course I also keep a fresh FOB battery in whether it needs changing or not