I Just Experienced the same problem with my console freezing.
I am running V1.3 of the firmware and did not have a USB stick in the console. I just ignored it and finished out service. We have people renting our building after us and I stayed for their service to show their sound guy the new gear and how to use it. After they finished their sound check i went to save a scene for their band and all of the previous scenes diapered off the list and the scene i was trying to save wouldn’t save. I then went to reset the console and it froze on a an error screen. so I had to do a hard reset.
I just wondering if anyone has experienced this problem with firmware V1.3 installed?