My old laptop with Windows Vista connects to NET via WiFI, my other (New) laptop with Windows 8, in same room, will no longer connect. There was no problem for two months connecting, now it won't connect.
I am having the same issue. Whenever my wife has her Macbook Air connected, it seems to prevent my Windows 8 laptop and HP wireless printer from connecting to the wifi network. It will attempt to connect and then cycle back through. I have a windows 8 desktop connected via a wired connection, and two iphones/ipads connected at the same time. The apple equipment does not lost the connection. However, wireless Windows 8 laptop and HP printer lost the connection. Rebooting the router "fixes" the issue. Turning UPNP on/off hasn't resolved the issue. Using WPA2 with AES PSK. Issue started popping up over the past few weeks. Router is running firmware version 20.19.8 for MI424WR-GEN2 version F.
Came across this which may help pin down things for you.
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