[ubuntu] slowing internet connection

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http://ubuntuforums.org – As soon as i start using the internet the speed is ok. afer a couple of minutes it startss slowing down. Initially the speed is more than 900k however its eventually slows down to 100k. i have to disconnect and reconnect to keep having the speed. My windows speed was more than 900k. i use wireless internet and the router is not faraway from laptop (HowTos)