Too much air has gotten into the negative side of the shock, this is what’s trapped in and cannot be released. So you basically have a little bomb on your hands. Like bigyinn has stated if you gingerly remove the air sleave with a rag in the eyelet wearing earmuffs and goggles you then can do a air can services once it pops off. If this idea scares you get someone else to do it. I did such a services in a open plan workshop and it made everybody jump in the shop when it let go.