I have no idea if it would work, I've never had the problem, but obviously
the dryness inside and the changing temps outside are having an
effect...which makes me think that if you could change the elasticity of the
paint it might survive. Would it work to "mist"/spray the images with a
water and glycerine solution? or maybe the cooking misters for misting olive
oil...a light mist of oil might soften the existing paint, causing it to
cling to the glass and it wouldn't then dry out as quickly. I will continue
to look to see if you are able to solve the problem...would love to know what
works.