When Exporting To Audio I just received a...

I've seen errors but Catastrophic?  no, not yet.... it sounds bad...

So what sound card are you using on that machine?  

Taking 4 tries to get the song exported/mixed down, sounds a bit strange.  Was it a particularly big project with lots of synths and FX in the bins or was is a simple small project? 

Is this normal, to take more than one attempt to export a project correctly? 

Perhaps it was simply a glitch caused by windows..... especially if it has worked fine before this.   I would do a complete shut down..... power off everything. then do a cold boot and try it again. That will clear all the buffers and things out of the computer's memory and allow you to start with a clean slate. 

Next time it happens, try a slow bounce.