[ubuntu] WLAN breaking down; how do I reset all network interfaces?

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http://ubuntuforums.org – Hello, My first question is: how do I reset ALL network interfaces in Ubuntu from the command line while I'm logged on to it? Is it possible? Thanks in advance. If you have time and more knowledge and mood or thinking about removing the bug, you could try reading my description of the problem: Well I have a problem with my Ubuntu Lucid 10.04, I also had the same problem with Ubuntu Karmic 09.10. After some time wireless connection just stops working, either shows it as disconnected and I can only reconnect it just once, and recently it started not showing any signs of not working in the not (HowTos)