so it's a tracking problem make's sense to me, and explain's the reason it's continually trying to focus it cant find the track it's sent ie the system.cnf which in turn point's to the elf.
now for a source of la chip's or a fix maybe it is faulty board's and the reason for v10 introduction.
another possibilty is the size of the heatpad used need's to be increased as charlie's post indicates using cdr/dvd-r media causes peaks that inturn will drive heat on the la.
"Light travels faster than sound. This is why some people appear bright until you hear them speak"