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hi i am dan i can help you with this. unfortunately it is not an easy fix for your system to work. the worst thing is having the stop leak in your system. the compressor making the hissing noise means the pressure is getting so high that it is bypassing the valves in the compressor and then it overheats and shuts off. that means that either the valves in the compressor or the expansion valve at the indoor coil is gummed up most likely by the stop leak. i personally never use stop leak as i see it cause so many problems like yours, also on newer units punting stop leak in the system will void any warranties from the manufacturer. the way to fix leaks is to spend the time and search for the leak and fix it. in order to determine if it is a problem in the compressor or the expansion valve i would need to know the pressures and temperatures of the system running. if this helps you or if you have any more questions about this please let me know.
the problem you are having is the system is building up too much pressure. the pressure is directly related to the temperatures. as the temperature outside rises so does the high side pressure in the system then causing the compressor to overheat. another possibility is that the system may have been overcharged with refrigerant. the system will need to be checked and calculate the superheat and subcooling temperatures in order to see what the system is doing.