I would guess that if it is an air filled ball they would need more air pressure in it during high pressure conditions. If it is a foam or sponge ball it just needs to be of a stiffer material. I think the best thing to do is remove the pig until the system pressure is stabilized.
The important thing about this is they identified a problem and developed a solution and implemented it all in a couple of days. That is a solved problem now.
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