Flattening and scaling in Adobe Illustrator CC 2015

I have artwork in Adobe Illustrator vector format. It has many layers. While in Adobe AI I tried to scale to 18 percent and it seemed to lose a lot (bits and pieces were missing). I tried to flatten the artwork but it still has all of the layers. Any suggestions? I have other tools like Photoshop CC2015, and AutoCAD 2014. I think it saves as a later version of AutoCAD (Even the dxf file didn’t work). As an ai file it is very crisp and clean.  
      Maybe there is a prerequisite to flattening?  On a scale of 1 to 10 with Adobe Illustrator; I am about a 4 or a 5.  Thank you for any help.
jampostGeneral MaanagerAsked:
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Leslie BloomCorporate & Product Marketing ManagerCommented:
Check to be sure you are scaling the strokes along with the rest of your image. Sometimes the vectors itself will scale, but the stroke (aka outline) will remain in the same weight, looking out of proportion or sometimes lost after the scale occurs.
from the transform panelfrom the menu Object > Transform > Scale

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jampostGeneral MaanagerAuthor Commented:
Thank you for your help.
jampostGeneral MaanagerAuthor Commented:

Thank again. Just letting you know that I followed your instructions and it worked perfectly. You're the best.  --  Joe
Leslie BloomCorporate & Product Marketing ManagerCommented:
Fantastic! Happy to have been of assistance.
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