I realize this is an old thread, but this (disabling awdl0) has been the sure-fire solution for me: https://medium.com/@mariociabarra/wifriedx-in-depth-look-at-yosemite-wifi-and-awdl-airdrop-41a93eb22e48
The WiFriedX app is optional, but is nice if you don't want to have to monitor the active state of awdl0.
_FailSafe
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