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Assuming the problem isn't the internal thread portion of the adaptor but just coming unscrewed from the male thread on the scope attachment...
Unfortunately this IS a common occurance!!
If the camera is out of balance in the anti-clock direction it can easily unscrew from the thread!!
I had a similar experience with a spectroscope! It just turned on the thread and fell, clipped my knee and bounced of the observing table.....
Took me a week, and a few $$$$ to re-build!
I now use an additional "safety strap" all the time. This joins the spectroscope to a piggyback adaptor on the top of the scope.
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