Nikon 24-70 F2.8 N Light Leak Problem

Its a big shock, I tested it my self and it is true.
Its ok when its at 50mm but when its 55 or 54 maybe it has this light leak.
That makes me think, should I buy sigma or fix the nikon lens?





Nikon Help Hotline Says "ITS YOUR FAULT" Click and watch
In my point of view, nikon should have made it better!!! The lens costs around 1100 quid and it cant even endure hot and cold weather?


But again I don't point my lens under studio flash and set the camera into high ISO and shoot. I'm always at ISO 200(digital), 160(Kodak Porta), 100(Fuji Provia)