I've heard this is an issue, and I experienced it yesterday while shooting some birds. My R5 locked up about 5 times in a row during one session. Each time I took the battery out and it froze repeatedly. Eventually it stopped, but I was not too pleased. Are others having this issue, is canon going to fix it, and is there a way to go back to version 1.4 as an interim solution?
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I have had similar problems with an R5 with battery extender while using my 100-500mm ever since I upgraded to firmware 1.5. I am using AI Servo at the time with '*' Set to Eye focus and 'AF ON' set to focus. This problem happens consistently when I am watching a bird for a while and take my finger off the eye focus back button "*" on my camera. I consistently get a crash when the bird starts to move, I press the eye focus. The key is a pause of at least 5 minutes. One work around is the hit the AF On button (Set to focus) first. At one point I made the AF On button my eye focus button, same result. I have tried all the above suggestions with no luck at all. The issue does NOT happen when using any other lens. I had a friend out with me yesterday who had similar problems and then they stopped when he changed his crop factor on the red menu 1. Now no more issues. Try it, since you are probably shooting birds the crop helps. Canon Needs to fix the firmware.
FWIW, I hadn't experienced the locking problem until yesterday. I shot a bunch of baseball over the two weeks after upgrading to 1.5.1 with no problems. But yesterday, my r6 hung almost constantly after getting a couple of hundred images in. Yesterday was the 1st time I'd shot with a single card in the camera. I eventually turned off the electronic shutter, but the game was about over so I can't say for sure if that solved it. I always shoot baseball with eye tracking on max framerate. I've upgraded to 1.5.2 now, but won't get to try it out until Thursday.
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.