started about a week ago but its getting worse and more frequent. I'm afraid eventually it just won't turn on again. the phone will turn off by itself and usually taking out the battery and putting it back in works. but now I have to leave it out for about a half an hour and put it back in for it to work. sometimes not even that. I just keep taking it out and keep trying til it works. is there a solution for this or does it need replaced?