Sony A9 focus problems

[Tredtog]

I have a Sony A9 with 200-600 lens. When I focus on a bird about 30 feet away all is ok. I then focus on a bird 60 feet away, againg all ok. When I return to the first bird at 30 feet it will not lock on the focus. Im set to AF-C. Ive tried all the limit settings on the lens and all the focus settings in camera from Wide to Focus point with tracking. Any help appreciated.

[Marino.Manolo]

Try resetting the Camera with the Lens connected.

[Tredtog]

Thanks

[Tredtog]

Did a full reset as suggested but still the same. Sending lens and camera to Sony repair centre. Thanks for your help.