TT Stops @ 1/3 Points on Records

Approx. 1/3 of the way into an album, and 1/3 of the way from the end of an album, my Teres 265 TT comes slowly to a stop (the motor turns off).  It does not do it all of the time but it will do it at least once during a two hour session.  I recently gave it a tune-up (checked all set-up measurements) and changed the oil so everything is to spec.  What do you think?