Wifi connection is constantly lost

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http://askubuntu.com – I have Ubuntu 12.10 on my laptop. For some reason - I don't exactly know which one - my wifi module doesn't work. So, I bought an external wifi module ASUS USB-N13. I've installed all required drivers, but I still have to run this command on every system startup to make this adapter work: sudo modprobe -r b43 ssb wl brcmfmac brcmsmac bcma If I don't run this command in the network utility at the top of the desktop I see that wifi is disabled by hardware switch. So, I run this command to make adapter work. And here's the question: after some time(may be 5-10 mins) connection is lost. I st (HowTos)