My Audio Files Have Been Disappearing After a Few Times Saving Them

[orbiting_io]

So I just bounced about thirty racks last night. All was well. I did some slicing ad dicing on a fight from SF to Vegas Saved the file and low and behold I open it to this...(see screenshot). Not the first time it's happened.
Any suggestions or theories? I've tried normalizing them. It goes nowhere. cheers!