Stable not using H+ further confirms my suspicion that these lockup up are a media issue.
Canon is clearly polling the card(s) for the following:
- Availability - Is there a card present?
- Current and total capacity
- read/write state
- Likely temp
Because preventing data loss is the primary goal of any storage team Canon's engineers likely do not have the capacity for recovery from a failed poll to or from the card. They leave the user and the camera waiting for that poll to complete and only a loss of power will release the code loop. Canon can fix this by running a timeout and a watchdog on the storage service but if there is a failure the data being recorded at the time will for sure be lost, for those that are experiencing this issue that might be preferred because the data is likely lost when pulling the battery anyway.
I suspect the reason Canon has not done the simple fix yet is because they have not been able to reproduce the issue in house. I run into this issue all the time with NVR's and Cameras that users have tampered with but never tell us that until we are on site...
In the end Canon really did not do themselves any favors by making the dual card slots on the R5 different. The combinations for Slot A (CFexpress) and Slot B (SD) on the R5 means that people can be running what has to be an almost endless number of variations of brands, speed, and capacity of card. There is no way to test all those combinations effectively.
I have never had a lockup on my R5 even after almost 15k images and hours of 8k and 4k footage. My R5 is a day 1 release with a serial number in the 900's. I have always used a Sony Tough 128GB CFE card purchased from local brick and mortar shop(I did make the mistake of getting the Prograde 128GB Gold that is not fast enough for 8K Raw) and 64GB Sony Tough Card that was a warranty replacement directly from Sony. I always perform a low level format after each image\footage offload and so far I have not had any issues.
I have a colleague that has an R5 and has had loads of lock ups and I am looking forward to when we can actually shoot together again so we can swap media and see if the issue is with the SanDisk 128GB he bought for a good deal on Amazon or if the issue is his body.
That all said the responsibility to make this right is still on Canon, they need to come up with a solution to deal with all the possible combinations for cards that users have.
A locked up $4K USD\$6K CDN Camera is not a great look.