As far as my knowledge, as soon as DSO informed the USCIS that the student have not been enrolled in any class, the USCIS will automatically terminate your SEVIS and you'll become Out of Status. In some case, if you didn't pay the due balance and didn't inform the DSO or Bursar ofifce about the situation, there's a high chances, your SEVIS will be terminated. Few semester ago, the DSO of my school told me that they will inform the USCIS only one month after the school starts. She exceptionally helped my at that time and told me i don't have to worry about it until and unless i turn in all the documents before she report the USCIS. Hope that info helps you.

KB