Toilet running inside bowl
tzzzz216 hit some pointers, but here i what I think is going on.
Look in the tank, there is a small tube that comes from the tank water fillvalve, and heads to the tanks flushvalve overfill tube, if the tube is inside the overfill tube and is located below the tanks full water line spot, it can cause the water to get siphoned out of the tank and you not even know it is happening, if that tube is below the full water line lift it up and above the water line this will stop that from happening.
Fix it right the first time, so you won't have to fix it a 2nd time.
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