Just a FYI in case anyone would have the same issue at one point
So suddenly my Kemper started generating incredible noise after playing it for five minutes after powering it on.
Even without anything connected to it, it would generate noise/static at the input section, turning it completely useless.
Did a couple of factory resets at the request of Kemper support, but that did nothing.
So I shipped it off and they repaired it. Luckily it was still just in warranty. Who knows how much that would have cost me. (it was just about to turn 3 years)
They replaced the ICM board, analogue board and a ribbon cable.
Here's the link to the video with the issue: https://www.dropbox.com/s/43pvs9di2f7sb1j/Video.MOV?dl=0