troubleshooting - Nikon D3300 autofocus issue

I just bought a Nikon D3300 from a guy from eBay. (Actually not eBay, but a Dutch website, same concept). It came with 3 lenses: an 18-55mm kit lens, a Tamron 18-270mm f/3.5-6.3, and a 50mm f/1.8 lens, all containing autofocus motors. As soon as I reach past 50mm in the zoom range, the camera stops autofocusing completely. It works perfectly fine as soon as I zoom out under 50mm. This is the same on both the kit lens and Tamron superzoom lens. They still try to focus since I hear a clicky sound which you always hear when auto focussing, but it won't move the focus ring. Anybody knows what's wrong with it?