wireless network works only 5-6minutes

Hello, I have installed FreeBSD-9.0-RC3 on my Thinkpad X61, which has Intel 4965 Wifi card, and the installer sets up wireless network using wpa_supplicant. It works after the rebooting, but after some minutes without using wlan it doesn't. To make it work again, # dhclient wlan0 must be invoked. I have tested it on FreeBSD-8.2-Release, but no difference. What exactly cause this problem and how to solve it?
 
It sounds like it's switching off to save power. Is there anything in /var/log/messages?
 
You're right. I've found the following message in /var/log/messages
Code:
wlan0: link state changed to DOWN
Do you know how to solve it?
 
Weirdly, now it works like a charm, albeit I did nothing about that. Anyway, thank you for your answer, SirDice.
 
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