I bought my Nova the first year they came out, and it has functioned flawlessly for about 4 years now. I did have problems of it jamming with 2 3/4 shells, but it was my fault, I wasn't running the action all the way back. Since I figured this out I don't have any problems. I hunt with others who have Benneli Nova's and they don't seem to have the problem either. I have shot everything from Ithaca's, Remington's and Winchester's, but this Nova has outdone them all.
I would have a gunsmith look at your action and make sure your ejection slide bars are setting in the tracks properly. In the older pump guns this use to be a problem.
Let me know how it turns out.