That’s interesting. I hope you’re right about the R5. I used the 5D4, R, 1Dx2 and 1Dx3 and have never encountered overheating.I had my 5D Mark IV shut down last week due to overheating @ 38C / 100F ambient shade temperature. The camera was on a tripod in full shade, under WiFi control via CamRanger 2, shooting nature pics. In such conditions the camera is working hard, sending a continuous live stream to the remote Mac or iPad. No surprises, no worries. The R5 will perform as well as any other camera in extreme conditions..