Check again your site and make sure it complies with TOS. Original content is not some used article with few changed words.
yup. i got accepted the same day i made my blog. that was 3 years ago tho.. who knows whats going on now
The question isn't whether or not, they passed copyscape, but is it original content??? Did you write the articles on your blog or did you copy them from other sources???
No, they won't ban you unless you are flagged by someone. Once approved, you are safe unless they detect that you are violating their rules (which in case of duplicate contents, they wouldn't be able to automatically detect that) or someone reports you.
I don't think copy content is the problem. And in fact one of my copy content site had already got the Google adsense. I think the key point is your traffic