i'm using sony xperia aqua m4. suddenly i'm having issues with my home soft button, although back and task soft keys are working just fine. the problem is, when i press the home button, it only vibrates, but doesn't take me to my home page. if i swipe home button up, it takes me to google as well, so i guess there's no hardware related problem. i restarted my phone to see whether this is just a temporary problem or not. after that the home button seemed to work just fine, but only for an hour. i have not rooted my phone. please help!