ticking sounds after enabling silent-boot

Hi,

I bought a RB2011UiAS-2HnD-IN a few weeks ago and I absolutely love this device, never going back to a “basic” home router.

I enabled silent-boot with /system routerboard settings set silent-boot=yes in the terminal.

The startup beep is gone now but the router is making little ticking sounds.
It’s not a very loud but it the kind of sound that when you hear it… you hear it.

The ticking sounds stop when I disable silent-boot.

Can I do something about this?

BenCo