Ok I have a really stupid or simple question. How do you keep your 35mm film containers from falling off the glass. I have repeated issues in my 40 vert where the containers fall off the glass. In my 10's they stay on the glass. Could it be the 10 verts have a higher humidity that helps the suction cups adhere to the glass better? The 40 vert glass does start to dry out a bit at times.