I'm having an autofocus problem with my new D5300: I've tested with both the 18-55 kit lens and the 50mm 1.8 AF-S, but it won't always autofocus. I have tested in good light conditions, with different kinds of surfaces to focus on, at good range. If I unmount and remount the lens, it will sometimes start AF, and also sometimes continue to work flawless and fast.
Everything is brand new - this is my first real try at using a DSLR.
Should I clean connectors, or contact the store I bought it from and/or Nikon?