I've owned this lens about 9 months, and it has consistently blurred even the slightest of motion, 100% of the time. I use the lens set either on f/1.8 or f/11, and only indoors. My camera is a D750, set to Aperture priority. Is anyone else experiencing this? If not, can anyone suggest tweaks to my settings? This blurred motion does not happen on my 28-300,, f/3.5-56 nor my 85mm f/1.8G. Any assistance is appreciated, even if it's try and get the lens replaced by Nikon. Thanks!