shark, you may have few issues to check out here ..1st most likley.. have you noticed that the system is not cooling as well when it does run ... if so, more tha likley you have a leak in the DX piping somewhere coil .. CU .. or line set .. next low air flow over the eveporator coil will cause this.. duct to small,return air restriction ,dirty filter .. bad fan motor ... those are the easy ones, my money is the leak , times that by 4 if the unit is a split system and last you could have a control problem make sure the CU does not continue to run after the indoor fan has cycled off, this can cause the evaporator to freeze up as well . call the folks who installed the system for you if they are worth anything they should fix this for you at no charge if the system is as new as you state .. also if the coils are leaking they should still be under warranty from the manufacture...... thats why you use someone you trust ,someone who cares about his name ..couse in the end thats all you got ..good luck