Why does my skimmer go berzerk ???

[kien]

Okay, this is driving me mental!! I've been using this skimmer (Bubble Magus CS220) since this past spring and recently it has been behaving strangely. At least once a week it will bubble over and flood the collection cup and spill into my sump. Drives me mad! I have only ever seen it do this when I use a lot of epoxy but I'm not using epoxy once a week. In fact, I'm not doing anything out of the ordinary. The skimmer has been cleaned thoroughly 3 times this month. The water level in the sump compartment that it is in does not change. I know that it'll do this if a new sock is put on that happens to have detergent residue on it, but nope, will bubble over with old unchanged sock. The first few times it did this I thought, okay, some spawning event or some such thing must have occurred. Well, this is still happening at least once a week and has been doing this for over a month now. If it keeps this up I'm going to throw this skimmer into the blue recycling bin.. after I've run it over a few times.