I have had a problem with LibreELEC / Kodi installed on the Orange Pi 3 board for a very long time (from the very beginning).
The problem is that the whole system freezes. In this state, the board stops responding to any command, does not respond to the ping, the SSH session is interrupted and the image on the monitor freezes.
The board responds only to the power button and, of course, to the power off. This problem occurs intermittently, usually within one hour of startup.
I needed to find out whether the cause of the described problem is the nature of HW or SW.
First, I tried to replace everything that could be replaced (SD card, cable, power supply). Unfortunately, no change.
Then I tried to install Kodi in Armbian OS. It was unusable (very slow, just an old version of Kodi).
Finally, I installed the Android 7 OS on the SD card and then Kodi. This is a combination you can live with, at least on a small monitor.
I let it run for a week and everything was fine. The problem did not occur. I am aware that this is not entirely sufficient proof that the board is OK. But I only have one piece.
What should I do ?