No Sound when changing outputs

Strange thing going on here, but maybe i’m just missing something.
First: I’m using the QC for 2 years without bugs until yesterday.

I’ve setup the qc with my victory kraken (4 cable method), but there was no sound. I thought of having an issue with one of the cables but when i rebooted my QC it worked immediately.

Strange thing: The Output 3/4 (which were going into the input of the Kraken) were showing a consistent output signal without even playing anything, every other output + input showed nothing even when i played something - like a freeze / bug kinda thing.

When i started the qc later the day and rewired everything to my studio setup (just output 3+4 going to my Monitor Speakers) it happened again (no in and output signal), i had to reboot the QC, then it worked.

Did anything like that happen to you? I could swear i changed cables multiple times in the past while having the QC ON.