Laser cuts perfect on manual pulse, but is erratic on programmed files

Hi any ideas why when running laser dxf file to cut it is awful. Power is erratic and quality is dreadful. Manual pulse cut is perfect.
Thank you

You are going to need to provide more information i.e. the machine you are using.

Hi Vince.
Thanks for message
It’s just one of the generic 60watt Chinese red box laser cutters. It doesn’t have a brand. To be honest it has been brilliant. Its weird its like the power comes and goes when you run a program.
When you just operate manually as test it is really strong and cuts beautifully.
It also seems to lose focus like its generating more heat than cut as plastic starts to warp.

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