[ubuntu] Wireless works only on boot

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http://ubuntuforums.org – I recently installed Ubuntu 10.4 on my new Dell Studio 1558. After installing the broadcom proprietary driver for my wireless card, the wireless for my laptop worked fine. However, if I boot my computer with the wireless off, I will be unable to connect to any wireless networks...even if I turn it on later. Similarly, if the wireless is working and I turn it off for too long, it will never pick up the wireless network is was already connected to. Is there some reason for this? Any fix I could use? (HowTos)