Hi Graig
If you drive at night with all lights on it may occur, that the headlight switch heats up too much and the bimetal in the headlight switch interrupts the lights. This affects front- and taillights. Suddenly you drive “blind” and if you are lucky enough you don’t hit anything or anybody. That happened several times to me as it also happened to lots of others. A new headlight switch may help but I wouldn’t trust it. A good advice to you: Disconnect the headlights from the headlight switch and connect them to a relais. Than connect the relais to the headlight switch. That way the headlight switch gets only enough power to activate the relais and doesn’t overheat anymore. Don’t become disillusioned!
Stefan