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Slit (lengthwise) a 1.5-inch section of a plastic straw and slip it over the chain that connects to flapper. Rigid straw section will keep chain from hanging up under flapper.
Take a small (2 inch by 2 inch) piece of aluminum foil and slide as much of it as you can between the float pivot and the flow valve. [The float is attached to a metal rod, the metal rod fits into the pivot mechanism and as the water rises so does the float moving the rod down at the pivot point closing the flow valve. After years of use there is wear on the plunger that the pivot operates on; the aluminum foil takes up the slack.]
That should bring all your toilet problems to a quick halt.
As a normal part of installing even a brand new toilet, the first thing I do is take out and throw away the ballcock that came with it and replace it with a Fluidmaster.
Been doing this for years and it's saved me many future problems. Adds about $8 or less to the cost of the toilet. Cheap insurance.