Topic: Noise on my UCX when I unplugged another USB Device

Hi,

I have a strange thing happenning.
Almost each time I unplug a device (usb key, external drive...) from usb port it starts a little noise on software playback 7/8 tracks (phone).
A recurring sound like : tac tac tac tac
The only way to remove it is to turn off the UCX

Any idea of what it could be and how to solve this ?

Thanks