A likely cause is the anti-skating setting. However it could have something to do with the cartridge alignmnent also. Try experimenting with the anti-skating first, if you believe the alignment is correct.
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TWL is correct in suspecting the anti-stating and also the cartridge alignment. You may want to check your connections, as well. Oxidation, broken wire strands and bad solder joints are usually a main culprit (in signal loss). If all else fails, try playing some old Clinton/Gore records.... that should balance it out :-)Good luck !