Wi-fi not working with Apple Cinema Display and Bluetooth-peripheral

Hello everyone.
I have a MacBook Pro (Retina, 13-inch, Late 2013), with OS X Yosemite 10.10.1. My problem is that when I use my macbook in closed-clamshell mode, the wi-fi connection becomes very slow and it regularly drops.
My external display is a Apple Cinema Display, 22-inch, model M8149. My mouse is the Apple Magic Mouse and my keyboard is the Apple Wireless Keyboard.
Thanks in advance for helping me.

Good day Brett,
I followed the suggested steps and for Wireless Diagnostics is all ok, but my connectivity problems are not solved.
I have made two report of the analysis. The first in "normal" mode is downloadable here. The second in closed-clamshell mode is downloadable here.
Could you tell me what is going on?
Thank you a lot

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