I agree with you, as it remined me before, i've seen this problem occurred before, like on my truck, this guy have the same problem with the diff of the truck like I do (from other treads) that it keep on loosening apart. and i e-mail the company but when I mention about the WARRANTY word, they don't return my e-mail, just wondering about that other guy that got this problem. I could tell if this is the duratrax, without a word, they will fix this problem. This diff problem I have was been raplaced by my own pocket, spending lot of money, (RAPTOR FROM PRP), the problem on this was a a wrong screw from the factory that holding the diff. assembly. So i also replaced this tapping screw to a aluminum fine tread screw.
I mention this for the good side of the duratrax warranty.