Black screened again, seems related to heat transfer with heat outlets
Upon a black screen, you lose all upgrades, grid items etc, keeping only money, money in buffer, and heat value (Note the negative value, heat outlets like to make the heat negative a lot).
I was adding more load on the reactor with heat consistently transferring all of it via heat outlet's into the grid, each heat outlet had 4 fan's. the second I upgraded my bottom left most heat outlet to the third tier (with all the top ones under load at 2nd tier) and increased the tier of the fuel rods, the game black screened
Note: the order these gained heat (the outlet's) was top down, and right left. Once they all had a little bit of a bar (around 30%) and I had reached the final pump that had an empty bar, I upgraded that pump and then the fuel rods, that was when the black screen occured. Hence why I think its heat transfer related.