Keep Losing Wireless Card Setup

[sjrlaw]

Every time I reboot my system, I have to re-establish the wireless card's connection to the network. I have to type:

sudo ifconfig <interface> down
sudo dhclient -r <interface>
sudo ifconfig <interface> up
sudo iwconfig <interface> essid "ESSID_IN_QUOTES"
sudo iwconfig <interface> mode Managed
sudo dhclient <interface>

I got this from one of the Sticky Posts above. Does anyone know why I have to do this? Can I create a script to do it? If so, how?

Thanks.