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A skimmer overflows for a few reasons..
1-Something has changed the surface tension of the water (coral glues/soaps/cyano chemicals,etc... and can certainly happen with carbon dosing/biopellet "effluent").. not fully rinsing filter socks,etc.. and many more things that do that..
2-Its sitting in too high of a water level..
3-Its exhaust valve is closed too far..
4-Blockage at venturi air inlet or air intake tube
5-blockage/dirt in air intake muffler..
6-Blockage/debris in needle wheel,etc...
7-other..
Taking it completely apart and giving all parts a good water/vinegar cleaning is a good start when they start to act "funky".. clean/inspect all parts..
Some of those reasons above will just cause consistently elevated water levels/overflowing.. Inconsistent overflowing (works good for a few days then overflows all of a sudden) is a bit more difficult to track down but usually follows some addition to the tank..
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