I'm using a Debian Lenny/Unstable/Experimental with a kernel 2.6.24.
My laptop is an EasyNote MX51-B-056.
An lspci give me:
01:00.0 Ethernet controller: Atheros Communications, Inc. AR242x 802.11abg Wireless PCI Express Adapter (rev 01)
I try 2 versions of MadWifi : 0.9.4 and the snapshot of the ng version of the 17 april. I've the same poblem.
My link with switch is very unstable. At one time, my browser can't contact the internet and a ping give a net is unreachebale. I can work with my network during few minutes or just for one second.
To "resolve" the problem, I make a ifdown ath0 && ifup ath0. But sometimes, this operation freeze my computer.