Jon, I hope you have a better and more sympathetic response from the official Sony Prime Support to this problem than I have so far had. Like yourself, the manufacturer should be grateful for serious
feedback from proper cameraman, in the interest of making a good camera more of a great one, which the EX3 so nearly is. What seems to happen when the handle crack you have also experienced develops, is that bending and flexing occurs when used. This in turn puts pressure on parts inside the handle,
probably small cables or circuit boards. Maybe this has happened with your handle damaging the zoom
rocker switch. On ordering a new bag, Kata CC-196, made for EX3, and which I am told is perfect,
the Sony specialist dealer did say others had returned cameras, which had problems with tight bags causing damage. You are right that the EX3 in this respect is a worry for hard work.