Hi Peter. Welcome to justanswer.
Try resetting the camera to Factory Default.
Select (Setup) Menu. You will see Reset All. Press Ok and then press Func Set button.
Reply if you have any difficulty in following the instructions.
Have you tried changing the focusing mode?
Then the fault is with the camera lens. It would require repair or you can buy a new one instead of investing money on this.
Is there anything else I can help you with?
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Thanks for the ratings. I am glad that I could help you out. Cheers!