SMB multichannel failover not working

Hello,

We've got a 4 node Hyper-V 2012R2 Cluster. Each node has 6 NICs. 

I've configured the following:

2 for ISCSI - MPIO,

2 for the Hyper-v switch and management - Teamed in switch independent dynamic mode

2 for Live Migration\CSV redirection -not teamed, using SMB multichannel

Now, when testing live migrations, I can see that both NICS are used at the same time and SMB multichannel seems to be working. However, when testing the redundancy, by brining down one of the live migration NICS part way through a migration, the migration(s) would fail. 

Could it be that I've missed something with my configuration, or is this normal behaviour?

I thought when using SMB multichannel it was still fault tolerant .

Thanks in advance