Inconsistent laser power

I have an issue where occasionally, while laser engraving leather stuff back to back, using the same settings, the laser will occasionally not provide enough power to properly engrave the leather. By that time, I have taken the leather out of the machine and won’t be able to line it up properly to try to re-engrave. And sometimes it really blasts the leather and burns off a lot more material than I had intended. It seems that the laser is a bit inconsistent in the output power, even though I am cleaning and oiling the machine as advised. Is there a way to fix this?

This is on the Flux Beamo