Distributed global environment. 5-10K servers. Some on Windows 2008. Some 2012.
Once per month, on almost the same date, the NIC config on the server will be lost for about 30 servers. We're in the habit of gearing up our support team the day before to expect it. You can almost set your watch by it.
A server reboot generally resolves the issue.
We have scrutinized almost everything under the sun...network hardware and OS versions, scheduled tasks and other activities, etc., etc., etc. We also have our hardware vendor working on this as well. They've found nothing either.
We're at a point where ANY ideas or suggestions, regardless of how crazy they may seem, are welcome for consideration.
Many thanks in advance.