Need HELP!! My AC compressor unit is in intermittent, On Off for a long period of time?

It will not stop doing that ,till I spray it with a mist of water,than it will hold.I do not understand the house gets cool anyway not too much but comfy. Some time it stays on continually for a long period.This unit is new,it was changed last year after a tree fell on top.I's a Tempstar smart comfort .
Update: R22 is the freon, and the fan is kicking in with the compressor, and the coil is clean, any other suggestion before I call the service man??? Thank all.
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