Recently built a PC using this motherboard and am having a weird issue where after coming back to the computer after not using it for a while, the internet won't work and nothing can be done but restart the PC to bring it back...

I'm using both ethernet ports, and they have the following drivers:

Intel(R) I211 Gigabit Network Connection

Driver Provider: Intel

Driver Date: 08/12/2016

Driver Version: 12.15.184.0

Intel(R) Ethernet Connection (2) I219-V

Driver Provider: Intel

Driver Date: 12/07/2017

Driver Version: 12.15.25.6712

The only timeout settings the PC has enabled is to turn off the displays after 15 minutes. Sleep is off, hibernate is off, screensaver is off. However this problem only seems to happen after leaving the PC overnight, as I have been away from the PC for over an hour without this problem occurring.

I have tried using only 1 ethernet port, I have changed DNS, I have used ipconfig /release and ipconfig /renew, but nothing will make the internet work properly until I restart the PC. Often a page will load with no CSS, and occasionally a full page will load, but then it will go again. Windows troubleshooter can't figure out what's wrong, and frankly I have no idea either.

We have 3 other PCs in the office with identical hardware and even driver versions and they aren't experiencing this problem.

What can I do?