I don’t see why the laser would make any difference to belts, you may want to check a couple things:
-Ensure rollers are aligned with pulley, otherwise edges will wear very fast.
-Make sure there’s no debris in the belt ridges or on the pulley, otherwise it will damage the belt and cause a weak spot.
-Ensure belt tension isn’t too high, otherwise it’ll break a lot easier.
You can see how I tension my belt in the belt tension video in this thread: X-Carve Maintenance/Troubleshooting Videos - Add Your Own!