5 Keys suddenly stopped registering (A6 through E7)

Servaas

Hi, as mentioned in the title 5 keys stopped working on my newly acquired keyboard (1,5 months old). No midi data is send to the daw and the corresponding lights on the light guide also don't illuminate. As I restarted the keyboard an error message popped up "Low power...". After a few additional restarts the message changed "Something went wrong...". Then all of sudden it started up again, but the aforementioned keys are still dead =/. Everything else works just fine.

What I already tried:

- different computers (Windows Desktop and MacOS on an M1 machine)
- different power supplies
- different usb cables
- firmware update (from 1.5.5 to 1.5.7)

It's seems like a hardware issue since nothing helped. Did anyone else encounter similar problems?

Servaas

Since the tag isn't displayed everywhere and I can't find the option to edit the title: the keyboard in question is a Kontrol S88 MK3 :) .