HELP NEEDED???all dash lights flashing sometimes while driving

Hi there help needed as i dont have a clue why this has just started.Ill explain!! right im driving along and all the dash and warning lights flash and the clock needles go up and go down as if something is resetting it self. some times the needles just do it and sometimes its altogether the full dash. i think it may be the ECU playing up but the car is 12 years old.sometimes the lights stay on for 15seconds, and sometimes after the flashing the clock resets.has anyone got any idea what this is or how to solve it.the car keeps going nothing altors that drives great even while this is happening it just puts the wind up you when your driving when the dash all lights flashing. even worse in the dark:shock:.please help if you can thanks phil