Anyone else have this problem?

This is my second Giant where the rear derailleur unscrews itself from the der hanger. :/

First was a '14 trance advanced (after 18ish months), now it's on a two ride old '16 reign 0.

Not sure if due to a faulty clutch (as someone indicated) of it's related to the cable housing - which tends to cinch forward as the suspension cycles. The housing eventually gets so tight that it wears itself out rubbing on the derailleur. :/