Sound quality drops down when I reconnect Wi-Fi

[Rage-]

I successfully used my USB sound card with Hackintosh since OSX 10.6 until upgrading to El Capitan (USB Audio ProDigy CUBE 24/96).

Hardware is: Core-i7 860/Gigabyte GA-H55M-USB3/8Gb/Ge-Force GT 240/Broadcom BCM43xx (originam AirPort Extreme from Mac Pro, works out of box).

Using latest Clover bootloader.
 

Now I'm getting such issue:
When I play music in iTunes or watching videos it works nice, but when I reconnect Wi-Fi or just click on Wi-Fi icon, sound speed slowing down (a bit) and audio quality getting 2-3 times worse (like 64 kbps MP3 comparing to 364 kbps).

 

I found a way to overcome this. Just rechecking "format" option to 480000 Hz and sound quality and speed gets back to normal.

But for sure, It's not good to do it manually everytime.

 

Any advices, how I can resolve this issue?

Where is the source of the problem?

Thx in advance.