[Alan Anderson]

There's a known issue on a cold powerup. Sometimes the WGA takes longer to boot than the cRIO. If the cRIO finishes its network configuration before the WGA is ready to look for network activity, some routing information doesn't get set and the link to the robot doesn't get established. (There is not yet a software update to work around this.)

If this happens again, reset the cRIO only (there's a tiny reset button near the serial port) without removing power. The WGA will already be operating and the network configuration will succeed.

If that doesn't fix it, you probably do have either an intermittent connection or a faulty WGA.