Yes, it is relatively common, but it indicates a minor internal plumbing leak known as a "phantom flush." This happens when water slowly leaks from the tank into the bowl through a warped or deteriorating flapper valve. Once the water level in the toilet tank drops below a certain threshold due to this slow leak, the fill valve automatically opens for a few seconds to refill the tank back to its proper operating level. Callout type="warning" title="Hygiene Warning": Wash your hands thoroughly after handling internal tank components. Verification: Add a few drops of food coloring to the toilet tank and wait 15 minutes without flushing; if colored water appears in the bowl, you have a leaking flapper.
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