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Two possibilities. Either you have a fountain pump with some current leakage to ground or the GFCI has failed and is nuisance tripping. Changing the wire size or breaker will not solve the problem. 99% of the time it is a failed fountain pump so I would test for continuity between hot to ground on the pump wiring. Anything above OL (zero) is a grounded pump that needs replacing.
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2021 Cayman GTS 4.0L
2020 Macan (dog hauler)
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