[ubuntu] Wireless Keeps Going Off On My Mom's Computer

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http://ubuntuforums.org – My Mom bought a laptop last year, it was a low end laptop. It's a Toshiba Satellite C650 I think. I notice that once the laptop has been idle for awhile, the wireless internet disables, and I have to restart it to get it working again. The laptop is set up the same as the rest of the computers, and non of the others have any problem with it. I have a Toshiba Satellite L775, and we also have another Toshiba Satellite C model laptop, and it works good. What could be cuasing it? (Hardware)