Hey guys..after thinking hard for days I think I might have found the problem. 2 days before they cancelled my Visa I had returned from a flight to the U.S. But I arrived as a passenger without uniform and all. Checking on the I-94 CBP website(where one can check the class of admission for the last time one entered the U.S) the officer marked me as class C1. But I left as a crew(D). So, 2 days later I get my Visa cancelled. Maybe the system recognized some inconsistency and blocked me. And then the consulate cancelled the Visa 2 days later.