Hi Aki,
I’m trying to clarify if this is an "App not responding" (ANR) error, which would imply the app is completely freezing and preventing all interaction (e.g., clicking or swiping).
You mentioned that selecting a new song from the song list or set list doesn’t work. Does this mean you can open the song list menu but selecting a song fails, or is the app completely unresponsive when you try to open the menu?
Also, does the app try to load the new song—for example, does the screen slide out and then slide back in, but with the original song still displayed?
I've only ever seen this once when using a set list and something gets corrupted meaning the app couldn't figure out what song was being shown and what should be shown next, but from memory, it ended up saying the song couldn't be found. I often leave the app with a song open during a break in my gig (approx 15mins) and haven't seen this behaviour. If you are able to reproduce the error on a regular basis, a list of steps that cause it would be useful, or a video if possible.
Gareth
Best regards,
Gareth