Sony have released an interim firmware update for the F5 and F55. This release is a maintenance release to address a number of bugs and stability issues reported by end users. As such it is probably a good idea for users upgrade to this release as soon as possible. In particular it addresses some of the issues cause by updating the camera to V1.2 and then not performing an “all reset” immediately after the update.
Please make sure you read the release notes and if at all unsure perform an “all reset” immediately after updating your firmware.