I configured my 2 DSS systems with Auto Failover. Everything thing is working fine but the failback. As it never worked before. It only works when I deactivated the failover and perform the failback on a physical IP address not the used Virtual IP Address.
If you have problems with the failback, please check that the replication ended and the connection is persistent.
Additionally make sure that the Virtual IP Address is configured on a separate subnet, than your bond. As it will cause a duplicated answers. Also, be sure that the target is not accessed from VMware (if used) and Windows simultaneously.