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https://www.usa.canon.com/internet/port ... s-firmware 

Firmware Version 1.5.1 incorporates the following fix:
1. Fixes an issue that in rare instances, the camera may become inoperable when shooting in the Servo AF setting while operating the <AF-ON> button.

I think I'll wait a month or two before installing.

Wildflower-nut wrote:I think I'll wait a month or two before installing.

With a camera as popular as this you will know within a week if there is a problem with the FW update.