My Z6ii has lost the capability of adjusting shutter speed using the rear command dial in all modes including S and M. I am able to change shutter speed using the front command dial in S and M modes by reversing main/sub command dials in the custom control settings. I am also able to change shutter speeds in S and M modes using the touch screen. So, the problem appears to be related exclusively to the rear command dial. I have reset the camera to default settings to assure that a menu setting is the not the problem. The camera firmware is updated to version 1.21. The camera was purchased new earlier this year. I was able to adjust shutter speed using the rear command dial prior to the firmware update.
Has anyone come across this issue? I am trying to determine if it is a mechanical problem or a firmware update related one. I have Googled the issue to see if it may be related to the recent firmware update to version 1.21 and have not seen any postings about update related issues.