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Message: <blockquote data-quote="photogramps" data-source="post: 366790" data-attributes="member: 30726">I don't have a D610 but I have had difficulties with my D4's A/F 'freezing' and needing to be switched off and on to restore it.The D4 has a dedicated AF-On button and it is currently back with Nikon who are trying to resolve it, (they've had it once for 6 weeks and failed to rectify the fault, now had it again for 3 weeks!). Suggest you send it back to Nikon but as it's intermittent, like mine, be prepared to give the fullest details of settings/symptoms as you may well get a "we can't re-create the fault" response.</blockquote>