Dear @marktomaras : " After several years.." after several years almost any cartridge needs service/re-tip or at least that be check by a professional about.
Several years could means several hours or not to many depending the every day average use and only you know about.
Everything the same and according what you posted a distortion at high frequency range could means the stylus tip is already prepared for a re-tip but only a pro can tell you for sure or contact directly to Lyra .
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.