I'm banging my head against the walls due to a very weird problem we have at my company.
First of all, my problem occurs only on W10 workstations (no matter the hardware, the build version or with GPOs enabled/disabled) AND our clustered file servers (2012R2) (it doesn't happen when connected to a simple 2012R2 file share - didn't had time to test on our database cluster).
Here is the problem : when a workstation has a network drive mounted and is disconnected from network (unplug the cable), the OS is constantly trying to reach out for the file server instead of marking the drive as disconnected after a few attempts. The pc becomes slow and irresponsive until the network comes back. Since we have for example Word configured to save files in the network drive by default, users are unable to save a document because word is just waiting forever for the network drive to become accessible again.
I haven't found any clue on the internet, except a topic with no solution and our IT consulting firm hasn't found a solution either.