ESXi NICs drop following update (VMware)

We recently upgraded a system from ESXi 5.1 to ESXi 5.5 and following the upgrade the onboard I350 NICs will go offline and won't come back up until a server reboot occurs.  The NICs will be operation sometimes for a week, or occasionally it will only stay online for about a half hour.  The net-igb is currently 5.2.5

Anyone else run into this issue before following a version upgrade?  Thanks in advance.
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Uptime Legal SystemsAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes we have ensure if this is a HP server you have firmware updated to latested versions and also update to latest nic driver!
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Uptime Legal SystemsAuthor Commented:
That's more or less what I expected but I did find that the most current driver version is 5.2.7 so we will install that and hopefully it resolves the issue.

Thanks for the second opinion.
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