Djm 2000 makes pop sound when changing effect channel

Hello,

I have this issue where a Pop sound will appear in the music when I change the effect channel.

It only occurs when the effect is active.

example :

Echo effect is On but the level / depth knob is set to 0

The channel select knob is set to channel 2

Now when I change the channel from 2 to 3 the pop / knick will appear.

I'm using the last firmware. Playing from One Usb, used with 2 cdj 2000's

Do I need to provide an audio sample ?

Can someone test it to see if they have the same problem?

thanks in advance

greetings