Since the very first version of Windows 10 Pro/Enterprise, I’ve had this issue whereupon a reboot and logging back in for the first time my network connection is not available. There network icon in the system tray near the time is also disconnected. I’ve been able to get around the issue by giving myself a static IP address but that’s very annoying and that should not be required to have a valid Internet/network connection upon a reboot.
The symptoms are basically NO network connection, LAN or WAN. Upon first logging into Windows, I immediately see the X on the network icon and upon opening a CMD window and doing an ipconfig command I see that I do not have an assigned IP address.
My first theory is that because I have an SSD, Windows restarts and logs me in so quickly that the DHCP service doesn’t get a chance to grab an IP address. But that seems absurd that DHCP wouldn’t be able to either sustain or grab an IP as soon as the service is started. I’ll continue investigating and posting my findings.