I had this once, at southport which is an incredibly bumpy and punishing track - I did about half a lap before the rear arm fell out. Like the sosidge man says, the car has a little slop at the inner hinge pins as standard - if you shim this so there is NO slop but it still moves freely then your suspension will not fall out.
Another thing to check is the plastic balls that go over the ends of the hingepins - these wear quite quickly, especially at the rear, and make it easier for the car to fall apart. If you put new balls on and shim it then it'll be fine. I've put metal balls on my new durga - though I'm not sure how easy these are to find (they are from the 501X). The alloy hinge pin blocks should also help but I've never seen a need for them and haven't bothered getting them on my new Durga.
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