I have a new Mac mini that is only used for music. I use Audirvana software. My Mac mini is connected to a dCS Vivaldi. I have recently experienced a problem. While listening to music, I start to hear a scratchy staticy sound which lasts 2-3 seconds and then my computer freezes. No more music. I need to reboot to get it going again. This problem doesn't happen regularly or at regular intervals. Any suggestions to correct this problem would be appreciated.