Followed directions in BLZBNTBNA00000005 (Battle.net Agent Went to Sleep) - Blizzard Support to no luck still having the issue. background for reference is I was playing this morning got disconnected from server and now the battle.net agent is asleep.
That behavior likely means this is more of a connection-related issue given it started with a disconnect. I would recommend the following troubleshooting Here. If the issue were to continue, consult with your Internet Service Provider who can help troubleshoot the local area connection.