This morning, I was listening to music on my iPhone when the screen started acting weird. It was slow to respond to inputs. Then, the screen froze up and then went blank. At the same time, the music I was listening to stopped playing. The battery was fully charged, and I have had this phone for only a month or so. I cannot get the phone to respond to anything except when I plug in my charger, and it gives the "charger connected" tone. I've left it alone for several hours now and still no luck. Any ideas as to what is going on here?