So I was working on a cad sheet with an xref.
Basically the xref exploded by itself and copied all the lines on to the actual drawing. There are bad linetype errors everywhere, and I cant open the file without it crashing on startup at the regenerating model phase.
If i xref the drawing into a new dwg all the work i had done is there and is fine and dandy... so If anyone has any suggestions on how to proceed I am all ears.