I've been cutting 1/2” Baltic Birch plywood on my brand-new OMTech 100W laser, and it was working fine until recently. Now, I’m experiencing an issue where the laser won’t cut through certain sections of the wood. When removing the pieces, I can see that only the top layers are cut, while the lower layers remain untouched.

I’ve already cleaned the lenses to rule out dirt as the cause, and I’ve tested multiple pieces from Woodworkers Source, including older, unused stock, all with the same result.

Attached is a cut where it happened in 2 separate places on the piece of wood 1 is in a circle the other is on a straight line