I have a computer with an Atheros 8151 PCI-E Gbit NIC built into the motherboard. The motherboard is a brand new Asus P8H67-V. Most recent drivers have been loaded for the nic.
The nic will go into la-la land at various times during the day. I can replicate the issue reliably by opening IE and going to Windows Update. When I hit the 'Custom' button, the bar goes across the window a few times and then... no more network.
But it gives no error messages in event log! Running a cmd window with a ping gateway -t command shows a bunch of good returns, and then 'Reply timed out'. This lasts for a minute or two, and then it starts passing traffic again like nothing is wrong. it doesn't show as disconnected, it doesn't say there is a media error, nothing... just "Reply timed out" as if i were pinging a non-existant address. When pinging the loopback address, there are no errors, and it shows good replies, even though the network is not passing traffic.
I tried to disable all of the TCP and UDP offloading, but that didn't help at all.
The nic is running the most recent version of the driver, but the problem persists, even when using an older version of the driver.
I am at a loss, please help!