RMBP 15" 2013 won't connect to wifi when USB or Thunderbolt connected

Has anyone else noticed any issues connecting to wifi when they have a device plugged in to the USB or Thunderbolt ports? Mostly happens when turning on or waking from sleep. As soon as I removed the connected devices it connects to the wifi instantly! This has happened when I've had my Apple monitor connected via the Thunderbolt port and on a seperate occasion when my iPhone was connected to the USB.
Tis werid!
I'm running Mavericks OSX 10.9.2 on a 2013 15" rMBP :-/

Go to System Preferences > Network > Click the Cog Wheel > Set Service Order > Drag Airport to the top.

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