I then tried to message my friend on chat (realid friend playing WoW) and he was able to read and reply to my message.
I then closed Hearthstone and then re-opened it again to find the message 'Closed: The application timed out while obtaining data from Hearthstone facility. Please restart Hearthstone to fix this.'
My guess is the servers are down?
Edit: im playing from EU and this is the first time this has occured.
Managed to log back in after about 15 mins but my Arena registered a loss for me :(
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