This is more of an AutoCAD 2008 scale list issue. In some of our Acad 2008 files, copying and pasting even a simple line took more than 10 minutes. The copy operation was quick. But the pasting operation went on and on. This is because of a bug in Acad2008 scale list, which the service pack 1 didnt fix. If you are on subscription and you are on AutoCAD 2009 or up, you are good!
There is a scalelist popup menu in autocad (typically) at the lower right corner.
Pressing this menu button shows the scale lists used in the drawing. Typically the number of list are less and shows like this:
The scale list of the corrupted file looks like this:
This image filled up the whole screen.
To remove all these scalelist, you can use the "-SCALELISTEDIT" command. Typing the comand without the "-" crashes AutoCAD. Using the "-" forces the command to use the command line. You can follow the command line prompts to 'reset' the scale list. You will have to keep doing this if the DWG files gets corrupted again.