It started happening to me as well and it happened two times so far.
The first time was during a soundcheck thankfully and it happened very shortly (5 minutes) after I turned on the kemper and it was in performance mode going back and forth between switches. I think it happened going back to switch 3.
The second one was during the gig when I pressed the switch to go into one of my guitar solos and the sound dropped off completely, which was very embarrassing.
I think i remember turning on the tuner after it happened and the input was working, but the output was off.
I also tried switching back and forth between other banks, switching on/off the tuner, and switching stomp boxes on/off but nothing worked except the reboot.
Note that in between these two occasions i had played a 3 hour show and it didn't occur.
I will try and go back to the previous version and see if it will be fixed!