I picked up an rx--2 turntable yesterday at goodwill with cartridge and stylus intact. When hitting start, it starts and set down on record and plays. When getting about 1/4  from end of record it seems to not be able to move any more  keeps trying to play the same groove again,  but if you cue it and move it a bit toward center it plays till end and then returns to home, what could be stopping it at the almost end of record?, will open it today and look inside , maybe a taught tone arm wire? Any helpwoild be great, thanks.