This just started about 2 years ago. Not sure why. Bathroom has a high ceiling - 15' or so. At first my wife thought it was bug clusters/ cob webs. I got a ladder and got up there to confirm that is not the case. It's a smooth ceiling, not popcorn. Previous owners removed the popcorn. Wrong paint for the humid environment in a bathroom? Sheetrock is not wet on the top side from roof leaks, e.t.c. 20200630_102431.jpg