Was reading about it awhile back, but others were having initial problems with cycling target/lighter loads and recommending shooting heavier loads to break it in. I had a handful FTF/FTE when shooting high brass, both 2-3/4 and 3 inch shells. From what I recall, I was still having problems after 400 something rounds, currently around 465 at the moment. I haven't shot the gun in a few months, so I can't say exactly if I'm still having issues. I always keep the bolt clean and lightly lubed. I haven't tried to break down, investigate and clean the buffer/spring system seeing if it could help.
Other than that, the gun is soft shooting when compared to a friend's Benelli Nova pump and really fun to rapid fire target loads and low recoil loads.