Wisely 60W JPT MOPA stops framing after 20-60 seconds

I am installing a Wisely 60W JPT MOPA. The laser stops framing at random times. The counter continues. If I fire the laser, it also stops at random points in the job after around 20 seconds. I have tried all the USB ports on the Mac, running through a UPS for power and direct to wall outlet. The current USB driver is USBLMCV4. I have a new USB cable on order but have not tried it yet. Any ideas what to try next?

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