Try this, in this order, exactly as specified. It appears to have worked for some people.
- Log out of battlelog. Don't just close it. Open it up and click log out.
- Log out of Origin
- Close the Origin software
- Open Origin
- Log into Origin
- Open battlelog. Open this in a web browser independently. do not open it by clicking on the game in Origin.
- Try to connect to a Karkand server.
Origin -> Options -> Settings -> Delete all game installers.
Did a restart and it worked. The guy said if that didnt work then try a repair install.
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Just relaying the info. Good luck, I hope this helps if anyone happens to come across an issue!