The disconnects of my MyT mount were (apparently) related to the 12V->48V converter that I used. When I wanted to check it out further, the converter shorted and took the MyT control board and the NUC down ... SH###!!!
So, I need fuses (as Richard always told me) and I need them such that everything works from home and in the field. This lead to this project to create a setup that I can use at home and almost exactly the same way in the field.