My workplace has recently begun rolling out e5480s as our laptop of choice, connected to WD15 docks. The ones imaged with Windows 7 seem to work well enough, but the ones on Windows 10 all experience a peculiar issue: one out of every 5 or 6 dockings/undockings from the WD15 results in the corresponding network interface to stop resolving the gateway and self-assign an IP, at which point the laptop becomes dead weight - Windows 10 starts acting like all its resources are chewed up and all applications become non-responsive. Even switching back to the other network interface doesn't help, as the issue now affects all interfaces from this point forward. You can't even restart because the user account can't log off - you have to hard restart.
IPv6 is disabled, only IPv4, on all of the network interfaces, with NetBIOS disabled across the board. We have a fairly mixed environment, and so far it's only the 5480s that are running Windows 10 and using a WD15 dock that have this issue. And the event logs give no details, as it just shows the network event of the new interface (wired when docking, wireless when undocking) toggling, then a list of other applications and services complaining about no network connectivity - it doesn't give any details as to why the interface has a self-assigned IP, or why Windows starts locking up when it happens.
Here are my troubleshooting steps so far:
The only thing I haven't tried so far is not using our image *at all* (i.e. formatting with an OEM disc). However, all other Dell laptops we use running that image don't have any issues; it's just the 5480s exclusively. For example, we have 7490s in the environment as well on the WD15 docks using the same image that have no issues whatsoever.
It's especially odd in that undocking/docking works fine 80% of the time. It's like a game of Russian Roulette when you go to a meeting - is this the one that's going to lock it up?
I found this post of someone having a similar issue, but there was no solution: https://community.spiceworks.com/topic/2089446-latitude-5480-ethernet-connectivity-issue
Does anyone have any ideas? I'm getting desperate at this point, and I feel like I've tried everything.
Thanks in advance.
If anyone stumbles across this post wondering if I ever got a resolution, I was able to narrow it down to our third-party firewall. Apparently it is an extremely rare issue that only happens in specific conditions (and I was [un]lucky enough to have the golden combination in my environment), and I'm working with the vendor now on debugging it.