I'm not an expert so no idea if my solution is related to your problem.
One of my onboard NIC's went bad and I had this exact problem. I installed a PCIe two-NIC card and that solved my problem.
If you have a spare NIC, might want to try it.
One of my onboard NIC's went bad and I had this exact problem. I installed a PCIe two-NIC card and that solved my problem.
If you have a spare NIC, might want to try it.