Have not broken any By accident. I buy new glass and shatter a really scratched one or two by placing in a shipping box of the new glass. One tap on the corner , and a pile of glass pebbles. I've heard of simple leaning on the floor or concrete and boom, pile of glass. Never heard of careful carpet placed and lean on the wall breakage. Have done that 100s of times and never broke 1. Sounds like a bad sheet - I'd ask for a replacement. Pinball life has the best price, in case the maker balks about it.