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I just upgraded the M1 Ultra module to a 20W. I was able to do about 5 hours (over 4 days) of engraving/cutting with the module without any issues. 

Now when I turn on the machine, or after cutting for a few seconds, I will get “Main control board temperature exception” error. This happens even when I just turned on the machine and have not processed anything so there is no way the control board is hot. 

I tried shutting off the unit, restarting my computer but the error still happens.