Gold Plastic Syndrome (commonly shorthanded to GPS) is fandom terminology used to describe the phenomenon of a toy's plastic decomposing and becoming brittle to the point of shattering or crumbling under minimal-stress conditions. In the most extreme cases, toys have been reported to spontaneously crumble to small bits without any applied force at all, even if they're fresh out of their unopened package.

Pic related is Bottle Change Rider #10 Kamen Rider Grease