Was cutting and suddently laser lost power, only shows the beam but cant cut

Good afternoon, I'm beginner with laser cutting, i bought a 3018 on aliexpress with a laser 15w i think, but i was cutting this afternoon and suddently laser lost power, only shows the beam but cant cut. what could be the possible reason for this?

Another thing is that every new pass for cut the laser was deviating a little so the cut was larger line and not thin. why?

Thank you, best regards. João Moreira

What i found is that my laser burned out, and turned into led mode.