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I have recently migrated two servers from 5.5->6.5->6.7, and the two of them are near identical with the exception of one card having an Intel I350 adapter. The server with the I350 adapter became very unstable and any serious sustained network traffic would crash the management interface.
This was troublesome as vCenter was also on this server (it's been moved to the more stable server) and everything became unresponsive. Restarting the management network via console did not help.
One thing that would always trigger it is a full backup (not an incremental backup) as it would transfer a few TB off of the host. It would always crash about 4-5 hours in the job necessitating a host restart as the management network would not reset.
I think perhaps part of the issue in our case is the onboard networking requires the igb driver and the I350 wanted the igbn driver. I've blacklisted the igbn driver and now ESXi is using the igb driver for everything.
I'm currently monitoring the backup but it's now in the verifying stage so I don't believe it will crash the management interface any more.
Hopefully 6.7u3 will be released soon - I will try unblocking the igbn driver then to see if the problem is resolved.