What can be the possible issues in this situation?

The situation is, I have a website (we are based in India) and it gets DAILY 'X' leads from the different countries. From last 2 days, apart from India, we are not getting any lead. And, I’m unable to figure out the exact problem, as I couldn’t find any major change in the Google Analytics and Google Webmaster tools.

From your experience, what do you think? What can be the possible issues? Thanks in advance.