Did you buy this camera new?
Are you using the Canon battery? How old is it?
Start by resetting the camera to factory defaults.
Is your memory card full size or microSD with adapter? Only full-size cards are recommended.
Please try formatting the memory card in the camera. Note, if the current card contains photos you care about, please copy those to another location before formatting. Does this operation complete successfully? If you have a second card and spare battery it may be helpful to test with both.
Bay Area - CA
~R5 C (184.108.40.206) ~RF Trinity, ~RF 100 Macro, ~RF 100~400, ~RF 100~500, +RF 1.4x TC, +Canon Control Ring, BG-R10~DxO PhotoLab Elite ~DaVinci Resolve ~Windows11 Pro ~ImageClass MF644Cdw ~Pixel 8 ~CarePaks Are Worth It
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.