I had a valve problem year back that had the exact same issues ... basically letting more by then it is suppose is what I was told. then can only be verified with testing the pressure while at rest and then running. Thing is he told me it may have just needed Freon but he checked everything and said the valve needed replaced and adding it at this point might mask the fact till it quits altogether (the valve). We replaced the unit do to efficiency. The old unit would need all Freon removed. Then replace the valve. Vacuum the system and lines. Then replace the Freon. At the cost of labor and Freon We decided to go to a more efficient unit. I hope that all makes sense. Short version get lines tested to see what the issue is.
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