Engraving Power Problem

Hello, I’m getting desperate.
the following happens, when i engrave and there are many on and off points on the engraving path, the laser loses power. as soon as there are few on and off points on the path, the full power is available again. I suspect a hardware problem. But I don’t know where to start looking.
The laser is a 60w Vevor tube with power supply. Controller is a Ruida RDC6445G. The problem occurs with Lightburn and RDWorks.

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