It is interesting to be because they go crazy with clean socks. The chamber is in an area that water level cannot be sustained at a height that changes without sock. I attribute it to maybe a sudden "gushing" of water towards the pump until it settles with a new sock put on. However it overflowed today which is why I ask. I am paying very close attention as I am still trying to find that sweet spot on my skimmer.
Corey