Hey I just got a sg4 a week or two ago and all was fine, right up until my micro sd card kept removing itself and remounting... then suddenly my phone would not recognise it anymore with no warning mesages. The micro sd if fine to my knowledge, being able to use it on my computer, even running a scan, to which it came back clean. I even hit the format button on the phone when I first got it. I'm running with a 32 gb class 10 lexar, so am I just blatently missing the obvious or is this a serious problem (eg: hardware problem)