Shutting off whenever phone call comes through. iPhone 4S

A couple months ago, I had water damage on my iPhone 4S.  It stopped working for about a month, and my IT husband brought home the little screw drivers for the bottom of the phone, and I unscrewed it and saw there was still some water in the phone, after messing with it and letting it sit in rice for 2 days, my phone has been working ever since!  The only thing that has been happening is my battery life will say 35% and then all of a sudden I'll get a notification saying that I'm on 10% of battery life (and that's without even using my phone for an hour) and when I would plug it in, it would go back to 35%. I can handle that, but the only thing that bothers me is that my phone will abrubtly shut off when someone is calling me and this JUST started happening yesterday.  Should I reset my phone and then restore it back to my settings?