Even Slight changes to tank conditions can result in Skimmer needing to be broken in again or stopping of skim process.
This information was detailed at
Barr Aquatic
Skimmer going "nuts":
Sometimes a skimmer will start foaming like crazy. This is normally due to a water change that it is just reacting to. The skimmer can pull gallons of water from the tank in a short time. Using an auto shut-off waste container will shut down the skimmer in this event, and is highly recommended.
Things that can cause overflowing:
Water conditioners
Dead animals
Live rock additions
Disturbing large portions of a sand bad
Conversely, the skimmer may shut down and have no foam at all for short periods of times.
This can be caused by:
Putting your hands in the water (oil on hands)
Feeding oily foods (Mysis, sardines, etc)
Cooking oily foods in the kitchen- The air sucked in to the skimmer may pull in oil too. You can add a floss air filter to the skimmer intake to mitigate this if it is near your kitchen.