Hello Seth, 
Could you try to reproduce the problem with b43 driver and disable hardware 
encryption:
# echo options b43 nohwcrypt=1 >> /etc/modprobe.d/b43.conf
rmmod b43;modprobe b43

The problem is gone for me.
Today is one week since the problem is fixed for me, no unexpected connection 
drops even with constant suspend usage (I have SUSPEND_MODULES="b43 bcma")

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https://bugs.launchpad.net/bugs/1058090

Title:
  [Macbook Pro 10,1] Extremely high packet loss with BCM4331 wireless

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