Golf VI R :: Random Noises From Rear End Occur On Lower Speeds?

So recently my R has started making noises that sound like they're coming from the rear end. It's hard to describe noises with words, but the noises are seemingly random except they occur more a lower speeds (5-15 mph) and I don't hear them at all above ~35 mph. It sounds like it's coming from the rear axle area, but it's hard to tell. The noises themselves are kinda like thunks, or pops or clicks.

The type of noise actually changes a lot as well: Sometimes it sounds like a popping noise a spring will make with being loaded/unloaded, sometimes it sounds more the thunk you'd get when a loose metal part shifts and hits another metal part. Sometimes is more like a groan you would hear from a large metal ship under stress from a wave or the like...