If the photoresistors are at the ragged edge of working they can shift out of spec with the change in temperature. I posted the solution to this today in this post...viewtopic.php?f=98&t=102188
The turntable not stopping when at rest means that probably CDS 1 is not in spec but if auto returning is working then CDS 2 and 3 is in spec. You might as well just replace all three anyway. That is assuming that the LED under CDS 1 is working.