@AndrewG The config.g you have seems to be quite an old one, and that bed.g wouldn't work with it. I have no idea how that would suddenly revert, but I would try and download the correct variant of the config files to use for your printer
https://github.com/Modix3D/Modix-V3-configuration-and-Macro-files/releases/tag/v3.4.5.c
edit: It might also be worth updating your firmware, those files are made for RRF3.4.5