Of the 10 questions you've asked:

 - 2 were deleted (both were downvoted)
 - 3 (different ones) were closed
 - Only 2 have more than a single upvote, and one of those is closed

Moderators are not privy to the exact algorithm behind the question ban, so I don't know for sure, but you're _probably_ right on the edge. In case you weren't aware, deleted questions still affect the q-ban algorithm.

I would suggest taking some time to edit your existing questions to improve them. Read "[How To Ask](http://superuser.com/questions/how-to-ask)" in detail, and update your existing questions to fit those criteria. Undeleting some of the self-deleted questions may also help.

Making some contributions back to the community also affects the question ban algorithm. Consider answering some questions as well, as this can help boost your score if you provide high-quality answers.