Carrior 38EN installed new 28 years ago. Modified 2011 when we got new furnace & condenser unit. Charged system with the "new" refrigerant. It has been working well. But today the compressor has been cuting in and out, running around 30 seconds many times. Before calling service man, I cycled off and on the circuit breaker for the compressor. Since has been running continuously for about 45 minutes & cooling OK. The circuit breaker has been in service 28 yrs. Remarks and suggestions, please.