Usually if you see that suspension reason, there's a lot of deleted content too.
Sometimes users struggle with asking questions. The community tries to help but new questions show the same problems. Sometimes there are several per day. If counseling the user isn't helping, the next step is usually a time-out to encourage the user to read our guidelines. Suspensions are not meant to be punitive but to stop problematic behavior.
A notice like the one you saw is the result of moderator action. If a user's first several questions are downvoted, closed, and/or deleted, automatic throttles kick in and then a question block if the throttle didn't lead to improvement. However, there is a reputation level (I don't know what it is) beyond which these throttles and blocks don't apply. The assumption is that new users are the ones who are going to run into this problem; however, the system doesn't take into account the possibility of a first question becoming hot and highly-voted.
Sometimes a user gets (un)lucky and earns privileges -- like dodging the automatic quality controls -- before really learning how the site works.