song stops before end play

Hello, I just bought a NSM Prestige 120B jukebox from 1972 and most of the time when the song in near the end it stops and replaces the record and goes to get the next one. It works correctly sometimes but mostly not.

Also the jukebox came with the technical insturctions manual but in it there is nothing about adjustment procedures or repair information.

Thank You for any help you can give me!................................... Corvettedude