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I recently reacquired the Fuji 56f1.2. It's a fantastic lens and I should never have sold it. However, my new copy of the 56 occasionally makes a humming sound that persists after acquiring focus in AF-S mode. I don't recall my old 56 ever doing this on my X-T2 so now I'm slightly concerned. For the rest there doesn't appear to be anything wrong with it. At about one in a 20 shots, especially at minimum range (though I've also had it happen at infinity), the auto-focus motor keeps humming after acquiring focus. Sometimes it stops after a few seconds, but I've also had occasions where it wouldn't stop until I'd press the focus button again or switch off the camera. It happens in AF-S mode. My question is: do other people with the 56 experience this occasional after-focus hum as well, or could it be that I got a bad copy? And my second question is; could it possibly damage or shorten the lifespan of the lens when the autofocus motor keeps running after acquiring focus? I would hate to have the lens work for two years and then break just after the warranty has expired. And my last question: would you keep it and try your luck, or would you return it to the shop and exchange it for another copy? Edit: Problem solved, see my post below.