I play on the Xbox 360, mostly as a Hunter. I'm not sure how long this problem has existed but, ever since I picker up the game again I've been noticing that, after a while, the Pocket Infinity starts to act weird. With the Pocket Infinity's special perk that allows it to "fire in full auto mode" activated, after a while of using it while holding down the Right Trigger, instead of it charging once and firing all five shots it will charge and fire then charge and fire again and again. I'm not sure if just waiting a while will fix this problem but switching to your Primary or Heavy doesn't fix this but switching your Secondary to something else and back to it does.