[ubuntu] wireless very slow in ubuntu 11.04

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http://ubuntuforums.org – Hi, I have another problem about wireless access in Ubuntu 11.04. After I installed the driver of the wireless card, everything went fine. The speed of downloading from internet can even reach 2 Mb/s. But I don't know why it got very slow after one day, like 20 Kb/s:mad:. The most wired thing is that, if I use a external usb hub which is connected to the same usb bus, again I get a high speed wireless access! So, the problem seems to be, I cannot directly connect the wireless card to my usb port, but if I use a external hub, everything goes fine. Do anybody has any idea about this? (Hardware)