Good morning everyone! I have a question about skimmers this morning.

The other day my wife came into the bedroom and said the skimmer was overflowing, i went over to the sump and sure enough it was just pumping water right over the brim of it.

I cleaned the skimmer and gave it a good vinegar bath, i guess it has been 6 months since i cleaned it oh well. When i put it back in the tank it overflowed right away even with the valve all the way open. i left it overflow for a day or so and now its skimming fine, running higher than it usually does and skimming wetter than it usually does.

This is the second time it has happened since ive owned this skimmer and both times seemed to be out of the blue?
Does anyone have any experience with this or advice? Thank you everyone!