Intermittent DNS failure in SLED11 SP1

For some reason my SLED11 SP1 work station periodically loses its DNS. Sometimes after going to sleep or a reboot it won't log back into the domain anymore. After logging in with a localhost account I can ping the DNS server's IP but cannot resolve its hostname. All windows machines on the network are working fine. Sometimes DNS eventually comes back, but I can find no rhyme nor reason to why or how.

The SLED SP1 workstation is using an Intel e1000e network card. The driver is installed and appears to be functioning normally. It gets an IP via DHCP automatically and detects the correct gateway and DNS server.

Any ideas?