I use version 005 of your S905 build on an OTT MXQ Pro 4k (p200). With my older Philips TV, the picture goes green or pink from time to time. Apparently, this is some problem with the hdmi handshake and can be circumvented by forcing the hdmi colorspace to RGB.
The odroid community allows this by setting a boot parameter. See Enable bootarg in order to force use of RGB colorspace by PabloCamp0s · Pull Request #1 · wrxtasy/LibreELEC.tv.7.0 · GitHub
Could something similar be implemented for your libreelec build?