Sony USA issued a product advisory for select Sony FE 24-105mm f/4 G Lenses which fail to autofocus. You can take a look at the detail below:
Thank you for your interest in Sony products.
In certain shooting conditions an out of focus issue may occur with some 24-105mm F4 Full-frame E-mount G (SEL24105G) lenses.
To address this issue, subject to the terms and conditions in the Limited Warranty that accompanied the Affected Lens, we will repair your Affected Lens, free of charge, through March 31, 2020.
We apologize for any inconvenience this may cause, and thank you for your understanding and cooperation.
These symptoms may occur under certain shooting conditions:
- The lens may not focus when using autofocus with close aperture
- The lens may be out of focus when changing the aperture after using manual focus
Check Whether or Not Your Lens is Affected
This only applies to SEL24105G lenses with certain serial numbers.
The SEL24105G serial number is on the side of the lens near the base.
To see if your lens is affected type your serial number in the box on this website, and then click the Check Serial button.
If you have further questions, please contact Product Support for assistance.