You need to reread the set up in the owners manual... Sounds like you do not have the anti skate set properly.
Check the setting of the Bias Adjustment Slider. Set at 2 or less.
http://www.stereophile.com/turntables/507rega/index.html
http://www.rega.co.uk/downloads/P1%20instruction%20manual.pdf
Check the setting of the Bias Adjustment Slider. Set at 2 or less.
http://www.stereophile.com/turntables/507rega/index.html
http://www.rega.co.uk/downloads/P1%20instruction%20manual.pdf