Made a backup in 4.01, then updated to 4.0.2, played a little bit, changed some performances, wanted to make a backup in 4.0.2, Kemper made the backup and then froze.
No reaction of any button pressing or turning switches.
Switched off electricity, started Kemper new, now it works again.
Newest:
Tried to do a backup in 4.0.2 again. Kemper froze again. Following error message on the display this time: