Well, one tester is not enough, please try to do the experience if you have a R5. The procedure is explained here. https://www.visionrouge.net/canon-r5-overheating-hack-solved/ In short: - Power the camera with a external battery and close the door beside the R5 (you can also do the screw trick if you like) - Record video until you see the overheating logo, or even until the camera shut down. - Turn off the camera by using the power button so your recording parameters (ISO and so