Getting just a bit more into UT, I guess I could get gdb on it, either by just finding a static gdb build and putting it in the user dir, or by making the system writable and installing it, and then attaching to the hanging process, but for the moment I'm just looking around.
uNav is really a QtWebEngineProcess and trivially freezing for me.
Pure Maps seems to be a native Qt application and it has been very rarely freezing (but it has happened) - on the other hand I'm not sure it ever actually stops locating with GPS while running, so it's hard to say if it suffers the same issue or not - What I'm wondering is if this is just a QtWebEngine issue or a general issue.