Why does Logic Pro 9's playback stop working after a couple of minuets?

I have recently upgraded to OSX Mavericks. Before this update everything was working fine. Now that I have upgraded, after a few minuets of using logic my playback stops. I have cheacked outputs and made sure nothing is solo'd or muted. If I then restart the project it works fine again for a few more minuets. There is no error pop-up either.

Any help would be appreciated.

Thanks,

Kyle