Plenty of weird error stuff is going on there...
I'd say do a full re-install of LibreELEC 9.2.2, and forget about skins and other add-ons.
Enable debugging and restart LibreELEC.
Then play one of your (problem) videos, and provide a new log file.
You could also run a DIMM memory checker, just in case. Any Ubuntu Live distro should have one of those on board.