Just a few questions to ask first. It will help anybody who would like to help you out.
Is it a new gun? If so, did you clean it first before going to the range?
How much shooting experience do you have? It might be an issue with limp wristing the pistol.
What kind of ammo are you using? The SR9s have a history of not liking steel casings.
I have shot my buddies SR9c a couple of times and it is a dream. He says he has never had any issues with it except for Tula Ammo. And if you place a five gallon bucket in the right spot you'll catch most of his spent casings.
So aside from the casings bouncing off the range dividers,if the above problems aren't it then it is probably something Ruger would like to look at.