ok so recently my main beam has stopped working , high beam works only on the left side, side lights and low beam both work and all rear lights work , only weird thing is that the central locking stops working when the main beams stop, ive checked fuses and earths, ive swapped relays around to see if that would change things, light bulbs and put in a new battery, nothing, but then as randomly as it stops working I can be driving along and they will all start working again for a day or so then stop again, I have no idea what im supposed to do, I cant keep driving using low beams and fogs at night , im stuck and getting desperate for help.