Scottie, I've had a lot of trouble with that hub. The driven sprocket is attached by 4 bolts that run through those channels, and it's separated about half a dozen times in normal use, no matter how much loctite I use and how tightly I attach the lock washers.
Since I seem to be the only one with this problem (the Symba community isn't as active as the RE community, but it's fairly active), I ordered a replacement hub, and sure enough, the channels run straight through. I'm guessing that I ended up in a progressive wear scenario, where running with loosened/wobbly sprocket bolts put extra stress on the channel mouths, which in turn created the opportunity for more bolt wobbling.
(It's also worth noting that I flog this bike, just like I flog my RE. I'm a large person and I ride it hard, on crappy city streets... all according to the philosophy that I bought these vehicles to use, not to keep locked up.)
So far I've done a hundred miles on the new assembly and there's no indication of anything loosening...