This is possibly the oldest type of hardware you can install LibreELEC on. I'm surprised it still runs at all.
That hardware is some 10 years old now. I'm guessing there is some new Linux version glitch on old hardware that makes your device misunderstand the shutdown command.
I don't think we can do anything about that anymore. The simplest thing to do during a (re)boot is to do a hard power-down (hold power button for more than 3 seconds), or simply pulling out the power cord.
Everything works for windows.
In general, a great answer)