Bluetooth: Call glitch/noise

[LatinBimmer]

Hi buddies,

I noticed a glitch causing a weird noise while listening to music via usb (iPhone) and I receive a call (over bluetooth) immediately makes a disgusting noise while stops the music and goes to bluetooth...

it happens all the time, not only if I receive a call, but also if I use Siri ...the first command (changing from music to siri" makes the same noise)

Anyone noticed this issue?

I have enhanced bluetooth
iPhone 6 Plus, iOS 8.1
...and good music!