Heres an odd one, never had this happen to me before. Anyway, my UV faces disappear randomly. If I recalculate my normals, they flip flop which are shown and which go away. And in the UV editor, whatever ones are “missing” are triangles. I searched the forums and google, but found nothing. Heres a screenie
Nevermind, fixed it. If this happens to anyone else, select only the faces that are giving you issues and Ctrl-N ONLY on those faces.