I've been having a strange battery issue lately. When my phone drops to 20% or 25% I usually plug it in. It charges up to 78% VERY quickly and then after moderate use will drop to 40% or so again very quickly. Often when charging it will jump from 78% to 100% instantaneously. Combined with how quickly it is discharging, I just can't figure out what is going on. I tried a battery pull and then charged to 100% again. Seems to still be happening. =\ Any advice?