Rear end noise in 4wd

So I just bought the Krx a couple weeks ago. I've put 270 miles on the machine and i have loved it. But yesterday i got stuck in the mud and had to get pulled out. Once I was out it makes a horrible noise when it's in 4WD. Like very loud banging under any sort of load. Gonna have to call dealership and get it in for repair but I find it crazy that it is already broke after being stuck once! Never even ment to get it stuck just went into a hole that was way deeper than I thought. Anyone else had issues with the rearend?