so ive been using audacity for about 7 years now and ive never had this issue before 
when i go to export this song i was making it becomes a distorted mess. its normal for about 30 to 40 seconds and then it peaks into nothing more than loud buzzing. anyone know how to fix this?
Are you using any real-time effects in the project?
I see at least three tracks that you mixed down to one. Which export format did you choose?