Tracking issues with my Naga Molten

Since it is such an old mouse, the sensor could just be having issues from its age. Have you tried using a different usb port, using a different surface for the mouse and maybe trying a different pc though?. You can also try to re-install synapse to see if that would fix anything. For the click on the scroll wheel, if you really wanted you could try and open up the mouse and see if there is anything in it like dirt or something that would be stopping it from working, however I am not sure how you would go about taking it apart and putting it back together. You can also try to do the things I said above if you have not already, but if it does not make a physical clicking noise there is something wrong with the mouse itself.

@ajdrigs Could easily be a hardware issue given the age of the device but you can try to clean the sensor and the mat. I would also try reinstalling the mouse drivers via Device Manager to make sure you have a fresh one. But it really is just as @Jenjar said.

Jenjar
if it does not make a physical clicking noise there is something wrong with the mouse itself.