Anyone else's 4S acting slow and sluggish lately? I usually notice it when I get a message and slide to open it. Takes a good few seconds for it to open and couple more to actually show the text. Sometimes I can't even answer calls because the touch screen becomes unresponsive. Also, just got an Apple TV and mirroring is really sluggish, for example jet pack joyride must run at like half speed. Not sure why, but my friends say similar things. Anyone else?