Has anyone experienced an issue with the auto mute feature when playing records on the Beocenter 7007?

Sometimes when playing a record the amplifier causes distortion in the right channel when the auto mute switches back on after the arm has dropped at the beginning of a record. If I press Phono again to raise the arm and then Phono for the 3rd time to set the arm down again the problem is solved. So there appears to be a 50 / 50 chance of this distortion each time I play a record. Once cured it is fine until I play another record wherby it seems to be pot luck if the distortion is there or not. Is there a common component which may be causing this that I can replace? Any help will be appreciated. Thanks, Colin