You cartridges could be magnetized and or you could have a loose wire or connection on the turntable at the cartridge end or the interconnect end.
I would demagnetize the cart then clean the connections to make sure they are good and tight and treat with Pro Gold or other. Also, stylus wear could be a problem or VTA or Azimuth could be off. Last if you are using a tubes in the phono section they could be weak tubes too.
That's just my opinion.
I would demagnetize the cart then clean the connections to make sure they are good and tight and treat with Pro Gold or other. Also, stylus wear could be a problem or VTA or Azimuth could be off. Last if you are using a tubes in the phono section they could be weak tubes too.
That's just my opinion.