If your in any of the country that's getting the heavy rains the humidity being as high as it is is a contributing factor. Make sure your doors are latching completely and that all the seals are tight. If yo have a deformed seal in some part of the door or the door isn't shutting tight, you've found your issue.
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.