Canon USA today has issued a press release that a new firmware update for Canon EOS-1D X Mark III (B&H Photo/Adorama/Amazon) will be coming in ealry April, 2020.
From Canon USA:
To Users of EOS-1D X Mark III
Thank you for using Canon products.
We have confirmed that the following phenomenon may occur during use of the EOS-1D X Mark III digital SLR camera. A new firmware release is planned for early April; once the new firmware is ready, we will make an announcement on our website.
We sincerely apologise to users who may have experienced inconvenience due to this issue.
Phenomenon:
When the camera is used with the electronic level set to “Show” in the viewfinder display, in rare cases, the camera may not perform normally when operating the AF-ON button or shutter button.
Affected Product:
EOS-1D X Mark III (Firmware version 1.0.0)
Workaround:
Use the “Hide” setting for the electronic level in the viewfinder display.
Setting procedure: Menu / Set-up 2 tab / Viewfinder display / Electronic level* [Hide]
*Default setting: [Hide]
Support:
In early-April 2020, we plan to release a firmware update to address the phenomenon listed above.
Contact information:
Please contact your nearest service centre if you have any queries.