Chalk it up to out-of-spec ammo. I have never had problems with S&B ammo you've used with any of my HK 9's. Ditto for the 40, 45, and 357sig.
The RSA in your P30 is good for at least 25,000 rounds, so you have a ways to go.
Also, try different ammo brands and see what happens. I'd be surprised if you experience the same results.