If coils are clean, or have been cleaned recently, then check your discharge side of unit for restriction. It may require you to take down ceiling assy, to be sure that there is nothing blocking the duct work inlets, if it is a ducted system. Also if ducted system, make sure you don't have too many blocked/shut off. As well you should have a freeze probe, or round sensor in the coils at front where intake filter goes over, (evaporator) to sense the frost, and kick compressor out until it thaws. When was the last time the evaporator and condenser (rear) coils were cleaned?
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