It's a known issue. Usually it only happens sporadically though. Happening "quite often" is a little unusual. It's happened on mine a couple of times, but it hasn't done it to me in a long time.
I've seen several different theories about what causes the problem, but nothing official from iRex about it. Some people have said that tightening the screws on the back of the case helped solve the problem. That would be something easy to try on your own. Just don't over tighten them.
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