[ubuntu] Weird internet connection problems.

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http://ubuntuforums.org – I just built my desktop, and connected it to the internet wirelessly shortly afterwards. I have a wireless PCI-E adapter in my motherboard. After a random amount of time(5-30 minutes), the internet stops loading. At the top corner, it still says I am connected to the internet. After clicking that icon, disconnecting, and then reconnecting once again, this same process begins again. To diagnose the problem, I attempted to use a wired connection. On this type of connection, the internet stops working every once in a while, but it fixes itself quickly. So the difference between the wired and wire (Hardware)