On my Lenovo G530 running fully updated 32 bit KDE, I have a Broadcom 4312 wireless adapter. Running 3.2.18-pclos2.bfs kernel. Testing repo is not enabled.
On my wife's Sony Vaio FS-500P running fully updated 32 bit Xfce, she has Intel Calaxia 2200 (sorry if I got the spelling wrong ... doing this one completely from memory). Running 3.2.18-pclos2.bfs kernel. Testing repo is not enabled.
Here's the really strange part that I don't think anyone has reported yet: if I right click on network manager and select "Manage Wireless Connections," nothing is listed in the network manager window. However, if I hit the "Disconnect" button at the bottom of the window, followed by "Refresh," I am able to see all the wireless networks within range. This happens on BOTH machines listed above.
Like others here, we (my wife and I) have experienced some awful wireless connectivity. The connection, after being so stable for so long, is now flaky. It connects and disconnects several times a day. The problem exists, regardless of which wireless router I connect to (I have 4 in the house, each with its own separate range of IP addresses).
I hope this helps in nailing down the issue!