Strange 802.11b PCI card channel problem

I have a Siemens Wireless PCI card in my computer. Its been running fine for a few months now. One day it just stopped connecting to my router. My laptop still connected fine and when I plugged my USB wireless adaptor in to the computer it connected fine. I've found that setting the channel below 6 lets my PCI card connect. But channels 6 and down interfere with my phone. I had been, and still am using channel 11. Is there some setting I must tweak to get my card to work, or is it broken?

I dont think its broken since it connects. but try to see if any other channels work with it or douse only 6. and by 6 or oher i mean anything higher than 6.