Why does my toilet suddenly start running water then stop?
My toilet, a few times a day starts running water for a few seconds then stops. How do I fix it?
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There are different ways. Do you have a picture?
Easiest way: put a little weight on the Part which close the valve/plunger.
A bit harder: try to clean the bottom/o-ring of the valve/plunger.
Or replace the o-ring Seal. I had this problem once, replacing the ring solved it. There was a continuous flow of water that drained the reservoir and thus leading to the influx of water every hour or so