We have a Chinese 50w laser had no dramas with it, yesterday was doing some jobs did 5 fine and then half way thru it stopped, We replaced the power supply, we have cleaned lens and mirrors and also re-aligned.
we then tried to do another job but we for some reason have to have the power at 50% when normally we never use any more than 20.

we have reinstalled rd works

the first photo of the heart and pictures was last night at power 30 and then the lettering was this morning at power 50

We have a 3000 chiller have checked that and all good