Thank you for your quick answer.
My configuration is :
Load Balancing: Route based on the originating virtual port ID
Network Failover Detection: Link status only
Notify Switches: Yes
Failback:Yes
2 Active Adapters.
Few more questions:
How I can configure round robin?
Do you have official statement for your explanation?
Still can't understand how it possible to have downtime while I always have 1 vmnic on active mode
Thanks.