Just got a super bargain on a Rowe R-91 - My first jukebox. It plays great sometimes, other times the 45 stops turning for a moment and the starts up again a second later. Sometimes happens several times in a row, sometimes once in a while, sometimes not at all. The readout says ER36 when this happens. I don't have a manual yet (any help with that?) and could use some advice on what to do to correct this. Thanks!