Scheduled Nightly Network Checks on Static IPs Causing Disconnects?
We have a T30 box and I recently upgraded to the latest OS version on the 21st June which has been our only recent network change. Since the 8th July we've been experiencing a strange issue where PCs reconnect and disconnect rapidly simultaneously during the night at seemingly coordinated times (though not the same every night). It tends to happen once a night sometime between 23:30 and 05:30. Whats stranger, is that it appears to only happen to PCs that have a certain NIC model (intel 82567LM-3). This NIC is no longer supported but we've had them for a long time and not had issues before. We have other NICs on the network, some that are older, which don't experience this issue.
We have 1 network subnet that our T30 manages which is DHCP and 1 network subnet that is static. The issue only seems to happen on the static subnet. The specific process in the windows event logs is related to 'e1kexpress'. Also, none of the PCs have had any Windows updates and are currently running Windows 7 (though I'm looking to update this to 10!).
My question is therefore: is there anything (a default process maybe) that the T30 runs daily when it maybe spots a time of low traffic (e.g. during the night) where it does some kind of maintenance or check on static IPs, that this particular NIC maybe just happens to not like?