Over the past hour I've been trying to send messages through whatsapp. (I have a lumia 520.) But when i click on the name, the app hangs and the chat doesn't open. I've tried locking the screen and trying again, turning off my phone. Nothing worked. Please help.
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1Have you tried deleting chats or clearing the history? – ksg91 May 3 '15 at 9:40
reinstall the app. And turn off the restrict background data usage in data sense settings.
