I have one HP 8570w out of two that we have been having issues with the NIC for quite a while. Randomly the user comes into work and has no LAN/WAN access until I come disable and re enable the wired NIC. At first I thought it was a driver issue so I updated the driver. It worked fine for 2 weeks (longest its worked) until this morning. I think the problem is autonegations between the laptop and the switch. For whatever reason it auto negotiated to 100MB Full instead of 1GB Full. Once I went into the advanced driver tab and switched it to 1GB Full the connection came back.
I have another 8570w with the same setup and same driver version that does not have this issue. I have tried moving switch ports and the issue persists. Is this a physical NIC issue or driver issue?