Freezing up after music playback

Has anyone had this problem? I get rather regularly, 1-2 times a day, where I need to hard reboot my phone. I'm thinking it might be because I'm playing flac files for the most part. I know the box and manual don't mention supporting flac but I found that it works and I use it. Anyone who is strictly using mp3 have this issue?

I have used my LGOG to play mp3 files quite a bit and not have any problems with it freezing. I have played mp3s for upto about 2 hours at a time.