MacBooks losing IP addresses and connection - iPhone and iPad fine

For the past couple weeks I have been having the following problem. I have to restart the time capsule in order for my macbooks to connect - however, my iPad and iPhone and apple tv get a wireless connection no problem.
Seems like the macbooks lose their IP addresses....
Once TC is restarted there is no problem - however something happens overnight and the next morning I have to restart....
I have had the TC for more than a year with no problems...
thanks for your help...

Tesserax wrote:
Just to be sure I understand your current network configuration with the AEBS, is the AEBS the only router in the network? That is, is it connected directly to your Internet modem? What is the make/model of the modem?
Does your AEBS have the following basic settings?
AirPort Utility > Manual Setup > AirPort
o Wireless Mode: Create a wireless network
AirPort Utility > Manual Setup > Internet > Internet Connection
o Connect Using: Ethernet
o Connection Sharing: Share a public IP address
AirPort Utility > Manual Setup > Internet > TCP/IP
o Configure IPv4: Using DHCP
AirPort Utility > Manual Setup > Internet > DHCP
o DHCP Beginning Address: 10.0.1.2
These are my settings.
The modem is an RCA Digital Broadband modem. Provided by my ISP.
The IP Address for my G5 is 192.168.n.3.
Is the G5 connected to the AEBS by wire or wireless? All clients (wired and wireless) should all be getting a Private IP address in the same DHCP-provided range from the AEBS.\
No - The modem is connected to a router. The router is connected directly to the G5, a printer, and the APBS.
Thanks for your response and attention.

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