Problem with my home network?

There's 3 pcs, and 1 iphone connected to the router. Two of the pcs are windows 7 and have no connectivity issues. The other pc, and the iphone will connect and work for a little while, and then loose internet. The connection is still visable when the internet is lost. Any advice?

Backround: i'm a electronic technician that doesn't dare mess with networking issues.

Assuming the iPhone and "other PC" are connected to the router wirelessly then, it is my belief that there's a channel interference happening thus dropping the internet connection. Try changing the Wi-Fi channel. You do this by going into the routers settings. (192.168.x.x)

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