I think cause it was there too long. I've ripped others trying to get them off so I'm trying not to with this one. I have a heat gun suppose I can try that.
I would try the freezer but I wouldn't try peeling it off frozen, I would freeze it and see if it falls off, if it doesn't let it come back up to run temperature and try.
Positive. Its random spots across the picture. My nba jam was the same way and ended up ripping one spot and another the size of a quarter ripped out and stayed stuck to the plexi
Water might help break the bond, I would probably put some mild dish detergent in the water, and peel a like back while submerged at a time, the soapy water should help with getting it off. That is what I did.