Blackberry messenger stopped working. what can I do?

okay so I have a blackberry Q5 and my blackberry messenger stopped working 2 days ago .i can receive messages but messages are not delivering . at first it showed that the APN settings had some problem , I searched through net , kept is as , still not working . and I cant remove the battery . rebooted a lot of times. please help .
Asked Oct 11, 2013

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