Turk1
Welcome to GB's!
This is usually one of two problems, neither is serious. First don't be shy when you close the barrel on an NEF, especially on a new gun. Sometimes they take a little "wearing in" for the machined parts to mate properly. Second the cleaning of the ejector area is important because if there is gunk or debris (yes sometimes there is) left over from the machining process, it interferes with the ejector and lock up assembly.
Remove the wood forend and spray something like break cleaner into the ejector assy. Next very carefully clean and degrease the receiver where the latch meeets. then once dry, lightly oil the moving parts, keeping the chamber area dry, and reassemble. That should cure it. Just dont baby it when you close it.