when starting playing, the turntable speed is some times much too high. I then have to stop and bring the turntable to complete stop, and then start again. Then normally it runs the correct speed. i did not measure the speed, but it could very well be double speed, so I wonder if the motor control is some times synchronising on the second  harmonic of the signal from the tacho? I only play 33 1/3, so I do not know if it also can occur at 45. does anybody have a hint? Thanks “Viking”