I had to make a workstation part of 2 networks so I just finished installing a 2nd Nic card and added a couple of route statements. Both nics are statically assigned their ip info. I did that 2 days ago and since then, at least once per day, I lose connectivity to the original network because the gateway ip address is missing. When you go to the 1st Nic's tcp/ip properties, the address is there but when you run ipconfig, the default gateway is blank. I have to restart the computer for it to reappear and work again.