Hey there, just to let you know the magnetic generator produces RF from lava and needs Grid Power to work, it doesn't actually produce any GP itself. I had the same problem with overloading machines. You will need to build some more GP producing machines such as water mills or solar panels to free up your GP network to solve the overloading problem. Extra Utilities 2 power system is kinda weird in the sense that if it runs out of energy, everything grinds to a halt. Hope this helps!