Clipping noises

HELP: kemper clipping noises
Hi to you all,
My unamplified kemper rack makes some clicking noises with no effect loop or no instrument plugged in. On all my outputs. Unpredictable noises. No specific rythm
100% sure: It is not my electrical system. Not my powered speakers
Thanks for your help.

I posted a video here
https://www.facebook.com/fredz…838&notif_t=group_comment

this protocol didn't solve the problem:[*]Switch the main knob to off
[*]Hold the left/top soft-key above the LCD
[*]while still holding this key - switch KPA to tuner
[*]Maintenance Module will be started
[*]In the 'Maintenance' menu goto 'Memory'
[*]Use Memory FormatFlash and InitFlash
[*]Check if the KPA works (booting, tuner)
[*]Check all the KPA settings