Does anyone have any experience in point to point laser soldering and laser light reflecting off of SMT component 'J' leads down on to the laminate. This appears to be a random situation we cannot understand nor control.
I may be able to help but would need to understasnd more about your application. The rating on the diode laser can directly effect its ability to refelct or penetrate the solder, but I would lnot to rule out beam placement at the joint either.
If you system is hard tooled (no vision) you may see variance in where the beam hits the pad, pin, etc which could also be causing this issue.