RichV

When I first got the camera on Wednesday I only shot with the 35 f2 and everything was fine, a great improvement over auto focus speed and image quality, the next day was out and put the 16 on to use and then it began to get a strange ratcheting sound and was the same with the 56 and not the 35. When I put the 16 on manual focus sound went away, it was a faint sound but a constant sort of clicking I reset the camera and it hasn't done it again, had a shoot all day yesterday and camera was fine. new firmware?