just my 2 cents. same issue here. i'm 100% sure its got to do with Chrome browser. Everything was running smoothly... I just bought the phone a month back... no problems. Then few days back i dload Chrome n use the copy-paste function n the 3rd or 4th time i used it it just crashed n phone went black. had to reset. ever since then, im able to copy and when i long press to paste, i just get the 'Clipboard' box which is unclickable.