iPhone Bluetooth Glitch?

[Project-79]

OK, so the other week, I was was playing Flight Control Bluetooth multiplayer for the first time. After I was done playing, I noticed my battery was quite low, but I assumed it was just low because BT was on (I normally leave it off). But, even after I turned off BT, my battery was still significantly dropping in power. I've tried turning on/off the phone, quick resetting it, turning everything on and off, and those only helped a little bit. Now I'm stuck with with 30 min/10% (5 hours) instead of what I had before, 45-60 min/10% (~7-10 hours).

Anyone know I can "fix" my phone to what I had before?

Thanks!