If the gun is only a month old, my general assumption is that the gun has not had time to "break in" yet. I know when I bought mine, it took roughly until the end of snow goose season before it really got smooth. One thing I have found over the last two years is that keeping a SBE II spotlessly clean all the time is not the best thing either. I used to break it down to the firing pin, magazine, and stock spring everytime I put more than a box of shells through it, and every so often (especially this Dec. when it was consistently below -10 here) it would hang up...

My best friend who has the same gun hadn't cleaned his since before trap season last summer and his was truckin' along just fine. So I started cleaning it only when it got wet or really dirty/full of good prairie dust and...what a difference.
The only other thing I can recommend is replacing the stock spring with an after market one. I replaced mine with a Wolfe spring (25% stronger and 3.5 inches longer than the factory spring) and it has made a big difference as well.
Hope this helps you some,
MM