Since the latest update (2.5.30.1091), if I split screen (three dots menu at the top + add new window) with another app while a project is already loaded, Dorico will freeze and then either freeze or force reload the project. If no file is already loaded it does not crash.
I can’t create a diagnostic report right now (see other post on that subject)
You should be able to find the crash log if you look in Settings > Privacy > Analytics. You can share the .ips file from there to your computer and then zip it up and attach it here.