Update: I connected the Snapmaker Original to my PC via USB. Using the console, I entered commands one by one to see where the failure occurs. I entered “M104 S205” which I believe sets the extruder nozzle temp to 205C. I watched the temp rise up passed 205 to 255 before it came back down. The temperature would swing back and forth until it reached around 203 to 219. But the unit did not restart.
I then gave it command “M140 S70” which I believe sets the bed temperature. I watched as it would rise up toward 70C but as soon as the nozzle temp fell the printer did a restart.
My suspicions were that the power supply was not able to keep up with the demands of heating the nozzle and bed simultaneously. Next I had my wife watch the green indicator light on the power supply while I entered the same commands again. The printer again restarted when both the nozzle and bed were heating up, and she said the green light blinked off and then back on. So I know the power supply is resetting.
Now the question is this: Is the power supply defective, or is the printer drawing more power than it should be in simultaneously heating the nozzle and the pad? Those wild temperature swings I saw on the nozzle have me concerned. I did not see the same behavior on the bed.
Any advice is appreciated. I have also submitted a support ticket on this.