"Flubbing" does sound like something other than static electricity problem. Look very carefully for things that may be touching each other that normally should not be touching. Best to get a knowledgeable friend to visit your home and take a look. These sorts of oddball problems are sometimes impossible to solve from afar. Is the cartridge bottoming out against the surface of the LP? In that case, yes, you need either a new cartridge or a new stylus assembly if your cartridge has replaceable stylus. But check your VTF else you will ruin even a new cartridge or stylus assembly, if VTF is too high.