Hey everyone! Alright so my phone has been pretty glitchy lately. Recently it started shutting down at about 40% charge remaining. It's weird too because normally when it shuts down because of low battery it'll go to the screen with the spinning circle for about 10 seconds, if you know what I mean? But now it'll just suddenly turn off. And when you try to turn it back on I get the battery bar with a little red at the end and the message to connect to power source. As soon as I connect it to power it starts turning back on. Once it's on it says it's charging and there's 40% battery remaining. I tried restoring it, didn't do anything. Does anyone just think this is a calibration issue? Or is it my battery failing? Thanks in advance!