Yamaha cd player spindle problem??

Need some help please, please, on a Yamaha CD Player model cdc-60.

Just replaced the laser unit and it detects the CD and the spindle motor
starts up ok. Hit the play button and the unit plays okay for about 15
minutes then starts to slow down, speed generally wanders around and
eventually stops and indicates there is no CD present.

Is this likely to be a motor problem? If not any hints? This unit is not
the best to try and work on as you can't get to anything while the it is
playing

Thanks for any help
TJB
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