There might be a problem with the clutch itself or a sensor related to it. Do you have your temp control on max cold when you use your A/C? Also, do you notice a difference in the cycling rates when the temp inside the car is cold or hot?
Refrigerant is cool stuff. It boils at around -20F so if you keep it under pressure, it will stay liquid longer. The liquid passes into the evaporator with hot air blowing over it, this cools the air and boils the liquid. The gas runs through the compressor, which adds heat. It then runs through the condenser out in front of the radiator. There is condenses back to liquid and heads back to the evaporator.
This whole cycle takes a certain period of time. If the compressor runs too fast for too long, the liquid won't fully boil and it will make it back to the compressor. This is a very bad thing. That's why there is a clutch mechanism to cycle it on and off.
Do you have problems getting cold air from the A/C?