Hi turtlerose07...
Sounds like you have one or two problems with the fluidmaster 400.
1...The float is set too high allowing the water to overflow into the overflow pipe and allowing your pump to run too much.
2...Flapper valve inside at the bottom of the tank is not sealing properly, thus allowing water to leak and causing the fluidmaster to keep trying to fill the tank with water and causing the pump to run too much.
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Check water level to make sure its not overflowing ,if not the flapper at bottom of tank thats operated by flush handle is leaking
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