WiFi interrupted connection problem

I have a problem with WiFi. Hardware is Linksys WUSB54GC, supported by the rum driver. After a few minutes of connection (using ifconfig or wpa_supplicant) it is interrupted. Ifconfig or wpa_supplicant show that wlan0 is associated/connected, but the network is not working. It seems as if it can not load DNS, because when I try to open a new page in my web browser it is without effect (not displaying "Problem loading page" or something like this). I use DHCP to connect. Restarting the netif daemon is a temporary solution for this problem. This same story is under OpenBSD (rum driver as well), but this adapter works fine under Linux and Windows. Does anybody know what is the cause of the problem?
 
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