The failover task occurred on 2011/08/24, 9:41 (in Primary wrapper.log) and 9:44 (in Standby wrapper.log). It is not understandable for me, why the failover started. Maybe you can read more information from the other log files and give me a advice, why the replication broke down.
I can exclude that the connection between the two servers was lost, because a continuous Ping Log every 30 seconds ran at that time and it reports no connection problems.