I would like to confirm what Simon has found. I turned off my router's 5.2GHz band (so I am only connected on the 2.4 GHz band) and have all this issues that have been reported for months now. I reverse it and connect only to the 5.2 GHz band and things are great. Connecting at home on the 5.2 GHz band is fine and all; however, I travel for business and 99% of public wifi spots are only 2.4 GHz. So, good news is: Bluetooth works fine, 5.2 GHz works fine.....but if I want wifi when travelling, I have to stick a Cisco-Linksys dongle thingy to my nice sleek new laptop. The irony is that the Linksys USB adapter has a Broadcom chip in it.
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