Sony recently released a firmware update for its FE 70-200mm f/2.8 GM OSS lens. See below for details.
From Sony:
This update (version 05) improves the accuracy of the contrast AF at distant shooting, making it easier to focus when the aperture is narrowed down to F11 or higher.
Download: Sony FE 70-200mm f/2.8 GM OSS Lens Firmware (v.05)