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Viper1 said:
Is the router acting as a DHCP server for your PC, Wii U and other devices? Sounds like a possible IP address conflict.

Might also want to upgrade the routers firmware if it's old.

Try changing Wi-Fi channels.

Try changing your security settings to WPA-2 Personal (with AES encryption) if they are not already there.

Thanks. 

Yeah, my Wii U, laptop, my brother's laptop, and my brother's PC are all connected to the one router, if that's what you mean.

Noob question; how do I change wi-fi channels?