For the record, I've a MacBook Pro 8,1 using broadcom 4331 chip. I find
the bcmwl 6.30 driver consistently unreliable, packets just stop sending
randomly and only solution is module unload & reload. I've had much more
success (not perfect tho, but 99% reliable) with the older 6.20 driver.

I spent a little time forward porting 6.20 to vivid kernel (3.19). If you're 
curious, you can give it a go here:
http://people.canonical.com/~gerboland/bcmwl-kernel-source_6.20.155.1+bdcom-1ubuntu0_amd64.deb

I am back to my 99% reliable wifi as a result. If it helps you, do let me know!
-G

P.S. the package version is older than the vivid supplied one, so you'll
need to pin (apt-mark hold) it to prevent it being upgraded.

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https://bugs.launchpad.net/bugs/1387199

Title:
  14e4:4331 [MacBookPro8,1] broadcom-sta kernel crashes

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