I have multiple macs, on 1 wireless network, never both online at same time

So here's the problem. I have an imac and a macbook air. I've been using my airport express for my wireless network. I've setup the airport express to have its own network name, and its password protected.
I've never had a problem with the express, its always been distributing wireless just fine. And I never have any problems connecting to the internet... EXCEPT if i have multiple macs on my network. (Before wasn't so much a problem, unless a friend came over. But now I have two macs).
On a daily basis, 9 times out of 10, if 1 mac is online, the other 1 get's booted. It acts as if they only have 1 IP address or something to work with from the express. Sometimes renewing my dhcp lease will fix the connection on a computer, but only to boot the other one off. And back and forth this goes sometimes. On other occasions, both lose their connections and cant get an ip address at all; forcing me to refresh the express to factory settings and resetting it all up.
I'm just trying to figure out what i might be missing, or why this keeps happening to me. All software is up to date, and it only happens to multiple macs (My room mate has a pc, but when i had only 1 mac we never had this problem).
Any help or pointers?

Noah Yamen wrote:
I've never had a problem with the express, its always been distributing wireless just fine. And I never have any problems connecting to the internet... EXCEPT if i have multiple macs on my network. (Before wasn't so much a problem, unless a friend came over. But now I have two macs).
On a daily basis, 9 times out of 10, if 1 mac is online, the other 1 get's booted. It acts as if they only have 1 IP address or something to work with from the express. Sometimes renewing my dhcp lease will fix the connection on a computer, but only to boot the other one off. And back and forth this goes sometimes. On other occasions, both lose their connections and cant get an ip address at all; forcing me to refresh the express to factory settings and resetting it all up.
Some questions about your settings:
In AirPort Utility, if you do a "manual setup" on your AirPort Express, In the "Internet" panel what settings do you see for
- Internet Connection/Connection Sharing
- DHCP/DHCP Beginning Address (three fields)
- DHCP/DHCP Ending Address
What is "upstream" from your AirPort Express?

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