stereo changes to bluetooth every time my macbook pro turns on

Hi, I just got a macbook pro, my first mac. I paired it with my onkyo receiver and works great but now every time I turn or wake up my macbook my receiver automatically switches to bluethooth. Also I can't pair with my phone, it only wants the macbook. Is there a way to only turn on the bluetooth on my macbook if I'm streaming music? Is there more settings for bluetooth?