My whats app not responding from yesterday. I have restarted my phone several times but its not working.  I am getting fed up with this OS.

WhatsApp company might be working towards fixing this problem, this is app problem I guess not OS. ...temporarily you can clear problematic chat room history, clear WhatsApp from task manager to get rid of this issue.

 Facebook has fixed many issues in a recent update.
restart your phone you will see notification for 35 MB Facebook service update. Once you install this update restart phone once more and check if the problem still exists or not.