For some reason both of my onboard NICs on my p6n diamond motherboard keep losing connectivity. Normally I would blame it on the network, but they're both plugged into an unmanaged switch, and the other devices on the switch don't have any issues at all. I have the latest drivers installed for everything, which may very well be the problem.
MSI P6n diamond mobo
4GB GSkill RAM
nvidia Geforce 8800GTS 320
Windows 7 Pro
It could very well be an issue with windows 7, I'm not completely sure. There were too many variables here for me to analyze alone, so i came here for help.