I was just about to report problems with booting/rebooting when the post 7.0.3.10 build was released. Looks like I wasted my time updating android firmware on my Beelink mini MX. Thinking about it now, it seems obvious that if Libreelec would boot without issue before, it was the changes to Libreelec that had caused the problem.
Done several reboots on the new version without problem. Thanks as ever for this superb build.