how much water is the SSS in? What is the water level (in inches) from the bottom where the skimmer sits to the water surface line outside the skimmer?
How old is the system? All skimmers have to go through a breakin period in which they will produce bubbles and then stop constantly. This is due to all the oils that come from the factory. The oils are slowly removed by the water. Once the oils are off the skimmer, then the skimmer will become a little more stable.