a/c NOT STAYING COLD ALL THE TIME

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WHY DOES SOMETIMES THE A/C WORKS AND SOMETIMES IT DOES NOT,JUST GOT IT RECHARGED LAST WEEK,DROVE 150 MILES YESTERDAY AND WORKED FINE HIT TOWN AND IT TURNED WARM/COOL TURN IT OFF FOR AWHILE AND WILL TURN BACK ON AND IT WORKS SOMETIMES IT DOES NOT.