I have 2 lights in hall, they're controlled by 3 light switches. They should both switch on and off in the same time. First light has simple wiring ( brown, blue, earth). Second light has 2 earth wires, 4 blue and 4 brown. I've changed light fitting on the second one and I have problem wiring it right. It works with switches but the other light stays on, can't switch it off. Help, please!