Canon just released a firmware update for the 7D Mk II.
Firmware 1.05 contains the following fixes & improvements:
- Improves AF accuracy when used in combination with the EF 16-35mm f/2.8L USM lens or EF-S 17-55mm f/2.8 IS USM lens.
- Fixes a phenomenon in which, in very rare cases, the "Peripheral illumination correction" is applied inconsistently.
- Fixes a phenomenon in which, while performing an EF lens firmware update, the progress bar displayed on the LCD monitor may freeze at 100% even though the update has been completed.
- Fixes a processing error in relation to the leap second for the "Geotag information appended to image" and "Log data" GPS functions.
- Fixes a phenomenon, where at the time of shooting in very rare cases "Err 70" occurs, or the shutter does not release.
You can download the firmware from the Canon USA support site