Im new here, hi all!
I have a secondhand D610 and it doesn't turn off automatically if I leave the camera off/on switch in the on position...
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What is custom function C2 set to? (Page 227 or thereabouts in the manual)
The first thing to do when getting a used camera is to reset it as the previous owner might have set things up far from the standard settings.
BTW, this subforum is for problems with the site, not for camera problems, your question would draw more attention in the Technical Troubleshooting subforum up in the Camera and Photo Help section.