A toilet that flushes normally sometimes but fails or acts sluggishly at other times is usually experiencing a intermittent mechanical issue inside the tank or a shifting partial obstruction in the trapway. Common causes include a flush chain that occasionally catches on the fill valve or overflows tube, a warped flapper that sticks open intermittently, or soft paper clogs that shift positions inside the S-bend trapway. Verification: Open the tank lid during a failed flush to observe if the flapper opens fully and the chain operates without binding.
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