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My understanding of it is that your computer had an IP assigned to it by the router, if your computer goes to sleep for a while that IP address within the router then becomes fair game for a new device, lets say a phone connects to the network and is given the IP that your computer used to have. When you wake your computer up if it decides to connect via the IP that it had been previously assigned without requesting a new IP, it'll get a error message saying that the IP is currently in use by another device.
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