Noise in 4wd?

Hi there,

I engaged 4x4 tonight for the first time in a month or two and noticed a bit of a noise that I don't recall hearing before. A bit of a "groan" type sound perhaps, more noticeable as speed increased it seemed. It's a 2014 with less than 15 thousand KM's and 4x4's been used only very periodically so far. Was it a little "out of shape" from having not been used much the past couple months?

Has anyone noticed anything like this?

Thanks!