Sounds like you may be due for recharge.
If the compressor runs without any refrigerant it will burn up.
So they use a pressure switch to stop the compressor once the refrigerant gets below a certain level. The refrigerant is being moved from the low pressure side to the high pressure side.
When you are low, there is enough refrigerant to start. However, once it starts getting cycled through out the entire system, it drops below the minimum pressure needed to keep the compressor running without destroying it........
That's just my take on your symptoms for what its worth.
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Sean
If Ain't a Newell, It Ain't Wurt Oonin!
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