Without more info I will have to give you several things to look at. Typically during the hot months rotary units experience temperature shut downs due to the following. Dirty oil coolers. Blowing them out with air my help some but ideally they need to be washed using a degreaser solution. Location. during the hot months poor air flow/ air removal may let heat from the compressor build up in or under the cover or room. This hot air gets drawn in by the compressor and raises the compressor temperature. The cycle continues until the compressor shuts down on high air temp. Maintenance. Poor maintenance on rotary screw compressors leads to shut downs on high temp, high air temps then play havoc on dryers which causes moisture in the air system. Maintenance items that need replacing regularly ( about 2000 hrs) oil filter, air filter, Depending on type of oil used change 2000 to 8000 hrs, seperator @ 8000 hrs. Also the amont element will cause high temps if bad. It is located where the three oil lines come together. There should be 4 screws that hold the cover on. the cover also has a hose connected to it and located close to the oil cooler. This amont element acts like the thermostat in your car. it lets oil bypass the oil cooler or causes more oil to go thru the cooler. the cooler oil and bypass oil mixes and maintains a certain temp. air end temp should run about 195 F and injected temp about 165 F. hope this helps. if you can give more detailed info I can get you closer to your problem.
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