Using the daily build of Ubuntu 11.10, using the default brcmsmac driver, I sometimes (randomly) get a very slow internet connection that seems to completely halt. If I disconnect the internet connection and re-connect, it is OK again, but only until it happens again, randomly.
I have a Broadcom 4313 driver.
This bug does not happen on previous distributions or on my windows partition.
I also cannot install propriety drivers instead, because of another bug: