A sink that suddenly begins leaking underneath without warning is usually caused by sudden thermal shock, accidental physical bumping of the PVC pipes while storing items, or the sudden failure of an aging rubber slip-joint washer. Over time, daily hot water usage causes plastic drainage pipes to expand and contract, which gradually loosens slip-joint nuts until a seal suddenly gives way under wastewater flow. Verification: Wipe all pipes completely dry and inspect each joint while running water to identify the exact point of failure.
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