Hi there: our 19H had the same problem in high winds ,ended up being the crank unit was faulty, fixed it myself rather than going to dealer. that was the smaller crankout portion of the big picture window. we also found the entire picture window had a habit of opening as well. as you are well aware that window is a means of escape in an emergency and with the window coverings,aka blinds being tight quarters between the table and glass the window locks were opening while lifting the blinds up, something else to watch for sure.
Happy Travels
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