To fix this we did the following Now we have teaming too.:emotion-2:  Hope you have similar success TTIME1 
Hi all, We currently have a Dell R710 that is used for an SQL Server database server. It is a future production system that will be heavily used, so we want to enable teaming on the 4 5709 NICs that are present on this R710. But, we are having some serious issues with teaming. As for the moment, all NICs are connected to the same Cisco 2960G switch. They are all on the same VLAN. In the near future, we are planning to buy another switch for redundancy, but it is not relevant here. I have downloaded and installed the latest firmware of the NIC from the Dell web site ( link ) I have downloaded the latests Broadcom drivers and BACS from Broadcom web site ( link ) Then, I decided to give a try to teaming. I fire up BACS 3, create a Team with all my 4 NICs in it without LiveLink enabled. BACS does it things and a new Load Balance NIC is created in Windows. This new NIC is DHCP so I open up the properties, edit them and enter a static IPv4. Everything runs smooth for a couple of hours and then no responses from the server through the network. I use IPMI to go on the server, it won't log me in, the server seems to be crashed. I hard reboot it and everything is back online including the Load Balance NIC. It stays fine for a about a day and then crash again. I then decide to deactivate the teaming and run only on 1 NIC for the moment. I have, according to Dell and Broadcom web sites, all the latests drivers, firmwares and softwares. Windows is updated. Any ideas why our server freezes randomely like this ? There is nothing in the Event Log of Windows and no BSOD to analyze. I can confirm that the freezes are due to the teaming, because the server was stable for 2 months before I enabled teaming 2 days ago. Should I have disabled something before enabling teaming ? Thanks for any help, Guillaume.
Broadcom 5709C Teaming issues in Win2008 R2