My best answer for you is this…
I had the same issues with my board. I would turn it on and after a while it just freezes. The audio still flows but you can’t make any changes to the mix without shutting it off and restarting. After a lot of research I found an article on what the problem is. It’s your power supply inside the board. Basically what is happening is it is not sending the correct voltage to the audio Console and for that reason it freezes up.
I went online and found on full compass website they sold the PreSonus 410-PG1PWR Power Supply PCB Assembly for my StudioLive 16.4.2 for $109.95. It was super easy to install and that fixed the freezing up problem I had with my board.
After reading many articles online I’ve noticed the StudioLive boards have the same problem With freezing up issues. I hope this company will fix this issue because it seems like a running team amongst the audio boards.
I hope this is some help and a way to be able to fix your audio board without having to pack it up and send it to the company and wait For them to do the same repair you can do easily at home