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I might have just replaced the connector - the new connectors are a bit better designed than the ones they used when this stuff first came out.
It's a mechanical friction connection, so especially if it wasn't done with the right spacing by the original installer, it can pull loose. The plumbing expands and contracts with temp changes and use, and the pipe itself slowly works loose from the metal clip that holds it in the friction connector.
But a lot of people do replace it. Keep an eye on the replacement when winter comes, and keep some of that diameter pvc, couplings, and cement around in case the new stuff catches a freeze. Polybutylene was used a lot in plumbing subject to occassional freeze.
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