Problem with Master 2 plus (it stops after about a minute)

I have a Master2 plus and use it for several years without a problem.
Now it stops after about a minute without giving an error.

When I restart the job, it wil stop again after about a minute , but not exact at the same place

I use the latest version of Lightburn.

It is not the PC or the cable because when I swap the laser for another Master2 plus , it works fine.

What can be the cause?