This happened to me a month or two ago, was happening mid job constantly.
At the same time I noticed that the fumes from cutting weren’t being extracted as well as they had been previously.
After inspecting the exhaust fan I saw that it was fully clogged with dust and grit.
I opened up the back, pulled it out and cleaned it thoroughly.
There are instruction in the maintenance thread on how to remove/reinstall it.
I also gently cleaned out the two fans on the laser module, the one on the back of the module was thick with grit.
This helped the fumes to be extracted again and I didn’t have a problem after that.
I could be wrong, but I think I recall that the material ignition alert feature is built into the exhaust fan.
This could be the reason the Emblaser stops and beeps constantly if it thinks there is to much smoke/fumes.
Just something to try.
Hope it helps,