I also connected my work laptop to the switch. Yesterday I installed a switch between one of my cable modem/router combo ethernet ports and my personal desktop. No way of knowing for sure, but it's been working as designed for hours now with multiple restarts and shut-downs. The reason I am thinking this is because, every time I turn off the PSU and remove the cable, my GPU LEDs reset, but only when power is completely removed from the motherboard, not when the computer is simply shut off. I'm thinking that fully removing power from the motherboard and allowing any components to deenergize allowed the NIC to reset per se. Between originally installing the switch (when this problem first occurred) and step 4 above, I never turned off my PSU (the actual switch on the PSU, not just turning the computer off) / disconnected the power cable. keep reading: Moved computer back up to original location, connected to switch using all the same cables from before today (aside from the RJ45 connecter I changed).
REPLACE KILLER E2200 GIGABIT ETHERNET CONTROLLER INSTALL
I’d suggest you bite the bullet, uninstall the current drivers and install the latest full driver package (including KCC) from the Killer website, then test again. Killer uses different chipset manufacturers for different generations of their adapters.
Killer E2400 is based off of a Qualcomm Atheros chipset.