Have you tried asking it nicely to stop?
Lol in all seriousness, do what Findecanor said and check the wire in the stab and make sure the whole stab (both sides) can move up and down with almost no resistance.
IIRC ePBT Origami has two different ISO Enters, a normal and an accent one. Are they both bad? Or is this happening with just one of them?
If all else fails, you can try warming it up via a hair dryer or putting it in some hot water. If you do go the hair dryer route, just start at a low heat and slowly ramp up, don't start off blasting it with a million degrees and end up making the keycap worse.