Does "professional refurbishing" ruin discs?

[floridaswamprat]

I have ordered from a retailer that advertises "Previewed, Professionally Refurbished" discs. However, my one experience with them was not a positive one. The disc that I received (Guardians of the Galaxy) would freeze in three spots. I have not had this problem with any other disc. Could this be a result of the "Professional Refurbishing?" I understand that such a process basically buffs down the protective coating to remove scratches. Does this compromise the integrity of the disc and create possible problems such as this?