Interference of bluetooth over wifi Macbook Pro early 2011???

Recently I bought a bluetooth sound system. When I started to use I noticed that the audio stream did not work well when my audio/video source is from my cloud hard disk.

Isolating the problem I checked that the quality of wifi connection goes down when using audio stream by bluetooth (or anything using bluetooth), resulting in fail or from wifi (speed falls to zero until turn bluetooth off) or from bluetooth (disconecting from device).

I've checked that this issue exist with many others macbooks but I could not find a solution.

How I solved it? I can believe that I've spend this amount of money in a premium computer seeking to have no problems and here is a big issue. As my computer is out of warranty I believe that Apple will charge me to solve it.

Any help will be welcome.