Another device on the network is using your IP address.

We have several iOS and OSX devices, plus one Windows one, regularly utilizing our home wireless network, based in a Time Capsule.  Occasionally -- like every few months -- we find this error message on one of our computers:  Another device on the network is using your IP address.  Often just waiting and trying again seems to solve this problem, but I wonder if we should be doing something differently.  Some of our devices do remain on, in sleep mode, overnight, and we do sometimes shut down the Time Capsule (only when all devices are off or asleep) at night.  Otherwise I think we are pretty normal users. 
Please share any insights you can!
Note:  I have found this article, which suggests this might be a problem which could be solved by Apple, but it is over 2 years old:  http://osxdaily.com/2010/09/19/another-device-on-the-network-is-using-your-compu ters-ip-address/

Yes.. it is all done in the airport utility.
DHCP lease time by default you can see is one day.. simply change that to 20min..
Fixed ip is via the DHCP reservations.. click the + and connect an IP to MAC address or name ?? of the client.. sorry my TC is offline.. I will get back shortly.
There is no disadvantage as long as the device is setup via the TC.. if you use static IP setting on the device that can often cause issues with the TC forgetting how to reach it. So if possible fix ip via the TC.

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    Hello jackemoe4,
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    sirioluce wrote:
    I have tried to turn off my modem and after that i turned on each machine individually it worked for a while giving my macbook pro and my Imac different IP address.. but the problem came back again and im here with 2 similar IP addresses on each machine and once that happen i lose the internet on both of them.. and I get an exclamation mark on my Airoport symbol.
    how can i change my IP address and where can i get a new 1.. should i just make it up..??
    TY
    What router are you using?

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