Squeaking noise with the Neokey?
 

Hi, I recently installed a Neokey on my US PS2 V3, everything works fine, but during gameplay of PS2 backups I hear a squeaking noise coming from the laser unit, more loud than usual. The PSX backups play fine no noise (well a little, just the normal when it loads).
If anyone that knows can please let me know if that's normal or is mine messed up or maybe my laser unit is beginning to fry?
Would really appreciated, thanks.