Hello all, having bit of an issue with my headlights, sometimes I turn the headlight knob all the way around and the headlights don't pop up at all, side lights come on, but no headlights

- I have to flash the high beams to get the lights to come up and then they work fine.

Any suggestions what might be wrong? It's fine nine times out of ten, it's just the odd time that irritates me.

TIA.
