I have a Shapeoko 5 with an upgraded spindle. Had cut out a couple of projects this AM with no issues. At about 4:00 PM the temperature was 104 and my shop is metal so i know that it was hotter than that but i was going to run one more project. The machine went through three bits changes and just stopped on the final bit change and just hovered. The final bit change was a 1/4" D/C for a full contour cutout. As i did not know what to do I hit the start button on the PC with a 90 degree V and it plunged into the surface. Question is does the heat affect the control board?
I would think it does, but I can say for certain.
I do know that my cell phone won’t work if it gets to hot.
IMHO at 104º that not only sounds too hot for the equipment, also the people trying to work in it. 
As the ambient air temperature rises, the control board electronics can end up reaching much higher temperatures with the reduced heat dissipation. The stepper motor driver circuits in particular could be getting critically hot with the constant current loads they handle.
If you want to keep your machine running reliably in higher ambient temps, dedicated cooling of the control board would definitely be needed - adding a fan to the shroud or perhaps a solid state Peltier cooling block. Or a CPU closed loop cooling block & rad.
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Yeah I run my machine in an air conditioned workshop and I have thought about replacing the enclosure for one with an intake fan and a lot more vent holes. The stock enclosure has only a few vent holes on the side. The fan inside the enclosure is for the power supply and it is setup to blow air at a different wall that the vent holes. After 30 minutes of sitting idle that fan goes to full speed and never stops. Honestly I think the enclosure on the S5 Pro is the only part that I would say is not optimally designed.
My guess is that @Larry75173’s power supply went into thermal protection mode.
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