Iíve had that issue with the window above the sink on our 2018 37RB.
In a really strong side wind while driving is when we saw ours open/flex enough you can see a gap on the sides.... but no amount of cranking helped close it. It was still closed solid at the latch/crank. Only happened on the one trip.
We were waiting for the window to shatter/break, but it didnít.
No idea what is the fix it for it and couldnít duplicate it for dealer to fix it.
2018 Seneca 37RB
2005 LJ Rubicon - Sahara #90
2019 Can Am X3 XRS Max
2009 ATC enclosed trailer