sounds to me that possible you have a stuck expansion valve and the compressor is over pressuring and shutting down, then when it starts up again its at high pressure and shuts off again. are you able to check the condensor core and see if its dirty? if your condensor is dirty then when your freon is pressurized it gets hot and causes even more pressure which would trip you high level cutout switch. and a third possibility is your evaporator core is freezing off due to running too long at full blast when the weather is really hot out, if so you need to check your evaportor core and see if its frozen. also do you have good air flow coming from the unit?
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