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Cartoonbear describe you pump and plumbing configuration along with the size and design of your sump. Too high of a velocity or flow rate through the sump is a possibility as are cavitation from starving the suction side of the pump or plumbing problems. I would highly recommend getting rid of the check valve ASAP, they are a mechanical device that will fail and uisually when you are not at home to catch it thus a flood. They are a false sense of security that can easily be defeated like a single grain of sand, flake of food, a snail, algae or any number of things. Never ever rely on a check valve or drilled suction break holes, both are afterthoughts and used as a crutch to prop up a poorly designed plumbing system. Always keep return lines high enough they break suction with a minimal backsiphonage and maintain room in the sump for that amount of water plus some and you never have to worry about a flood and can sleep well at night. Nothing is a substitite for a true air gap.
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