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When I restart my s3 it says preparing sd card then displays an error saying unable to download please try again later. But I can still browse my sd card with no problems. Just a bug?

Welcome h1rtz21!
Some questions here, bear with me
Does this happen each time you restart? How often do you restart?
What is attempting to download? Do you have a good signal? How about on wifi--does the download complete on wifi?
Are you/were you trying to download an app? Or an attactment?