PS2 SCPH-35000 drive sometimes makes cracking sound reading disc

Hey guys,
my ps2 laser / disc drive makes weird cracking sounds while reading some games, other games read fine...
Is this just a dying laser or is there another problem with the disc drive like the laser touching the disc? I uploaded a video of my console reading a disc for context


Another weird thing with that laser is that the DVD pot was set to 681 ohms from the factory, isnt' that way too low for a 400B?
 
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