Irregular cycling of your sump pump can occur for a multitude of reasons such as a broken float switch or the float valve being too low. No matter the case, irregular cycling, particularly in conjunction with any of the other listed signs of a sump pump in need of replacement, is never a good sign and will need to be addressed by plumbing professionals a tDick Ray Air Conditioning, Heating, Plumbing, Drains as soon as possible!