Are you using the same website link in your description? The URL can be an instant suspension. I have a URL that I got blacklisted about a month ago. I decided to test it the other day. New account, new IP, new videos, everything. The only linking thing was my URL in the description. It didn't last 24 hours before the account was suspended. So if you have a URL banned, it gets ripped within a day maybe 2 days. Use a new domain or tinyurl or something.
Youtube can pick up the music, so any new music on your video is infringing copyright.
Youtube can detect images off the videos, and even taking 1 video and adding extra junk before and after, can still get it deleted. A video can be banned as well, no matter the title or anything.
Also they can be anal about you saying "GET YOUR FREE XBOX" when really they are all catches like zip submits or emails subs. When promoting products like that, be careful how you word it or you fall under the "misleading text" class.