Check your roll cage bolts. My brother and I have had our Teryxs' for about a month now, and he noticed he bolts on his roll cage were all loose and some of them almost totally backed out. I checked mine and I had the same problem.
the bolt is a metric for asian cars m10 . i tried lowes, pepbopys,checkers and finally found them at autozone.there in a clear plastic and red cardboard package. i couldnt find the flanged style. ill just go to a specialty nut and bolts house to have a couple in stock. I might even go the loctite route.
The cages are assembled at the dealer, I imagine you and your bro bought them at the same dealer? Dealerships often use an inexperienced "mechanic" to uncrate and assemble units. I know, I used to do that job when i was 14 and 15....
Always nut and bolt anything new from a dealership, at the speed they slap these things together (often thay are paid per unit assembled) it's in your best interst.