A toilet that randomly runs for a few seconds every 10 minutes is experiencing a slow internal leak through the flapper valve. As water steadily drips past a degraded flapper from the tank into the bowl, the water level in the tank gradually drops until it hits the trip point for the float mechanism. The fill valve then kicks on for a brief moment to refill the tank back to its proper height and shuts off. Verification: Watch the water level inside the tank; if it slowly recedes without any external leaks, the flapper is leaking internally.
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