Are you still having this issue? I recently ran into this problem but it was only on Chrome, Firefox worked fine. The trick was to clear the "site settings" in Google chrome. Settings--> Site Settings--> All Sites --> Remove any suspicious sites (or clear it out).
After doing this I haven't had any more problems. It's not a problem with CC it's a browser or DNS issue. If you are having this problem will all browsers it's likely DNS poisoning.