turns out to be an issue with the Nexus SV version and VMware.. Here is the posted solution from support
This issue is mostly a result of multiple fail overs between VSM's in an HA configuration.
To restore connectivity issue perform the following..
1. Login to the ESX host.
2. Restart the DPA with the following command.
/etc/init.d/vem-v1xx-vssnet-dpa restart
This issue has been fixed in the following version..
* Cisco Nexus 1000v 4.0(4)SV1(3)
So after issuing the above commands, must upgrade our Nexus platform to version 1000v 4.0(4)SV1(3)
thanks all,
chris