Check that the laptop and desktop are not having an ip conflict. The ip addresses should be 192.168.0.2........0.3.....etc with the router having the address of 192.168.0.1.
Change the channel on which the wireless signal is transmitted this is usually 1 to 11, there maybe some interference from a outside radio source.
Finally.....is the microwave being used when the signal drops???? It will in most cases cause the connection to become unusable.
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