You can go to the set up menu and in the utility menu it will show you the internal
operating temp.
I use mine QU Pac outside in the heat with no issues, I do have low speed fan built in the rack blowing into the bottom vents, to keep the sun directly off of it I’ll put either a white towel or reflective solar tarp over on it at times.
What’s it do when running inside where it’s cool and out of the sun?
Try resetting the settings to zero. I was able to fix the problem this way.