HI
Many people are having issues romaing with these cards.
But one thing I have found is that there is no way that you will be able to roam successfully with all of the a, b and g standards enabled at the same time. Try just having a and b turned on. I found that definitely improves things. Then try using Wireless Domain Services (WDS), which has an in-built Fast Secure Roaming feature. FSR is not perfect, but it can have some positive effects, if one can get it to work correctly and reliably!!!!