Sabrent products have been around a good long while. I've used their adapters (various types) for different things PC related. They are not top on my list of cards I'd use with my body.
Two card brands I don't care for are Lexar and Sony Tuff.... Some people swear by them, but Lexars seem to have a higher that average failure rate and the Sony cards seem to be more finnicky about what they will or won't work with.
I'd stick with higher end cards for reliability, and absolutely buy from a reputable vendor (mentioned earlier). My brands of choice are SanDisk, ProGrade and Angelbird. I use all 3 and 0 issues
The AngleBird is also a little less expensive than the Sabrent. 💰 Nothing wrong with saving a little loot when possible.
Everyone has difference preferences and experience. My experience might not be the same as yours. In my experience, these cards have worked every time. They don't glitch, freeze and luckily, I've never lost an image. They are brands which have earned my trust. The truth is, all hardware eventually fails, and any card can fail, even if its a brand you've used for years and trust.
CF Express B v4 are starting to hit the market now, but there is no reason to buy these cards for the R5.
As suggested earlier, I'd look at the following:
Reset camera's main and custom settings to defaults
Use brand name cards from reputable vendors. Ones which are certified by Canon are best
Format the card(s) in camera prior to use
Use OEM batteries which are known good condition
Use OEM lenses, or at least use a Canon adapter with a 3rd party lens that was manufactured within the last 5-8 years.
If you continue to receive err70 messages with multiple cards, batteries and various lenses, the body should be inspected by Canon. If you can reproduce the behavior consistently, even better.
***EDIT, I have never enabled Airplane Mode. On my T6s, 6D2 or R5 C. I normally keep them disabled unless I am using the Canon Connect App for image transfer, GPS or time and date sync. Note, I've never used them in Cinema OS since onboard wi-fi does not work on the R5 C except in photo mode.
