Okay finally, someone having the same problem as me. My driver's side headlight does not turn on every now on & then. Not consistant, not daily like yours. But it always happens upon starting the vehicle, never noticed it going off on its own while driving (not that i've noticed anyway). But yeah, dealer said to bring it in when the light actually doesn't go on so they can diagnose the problem. Problem is, the light's been coming on most of the time lately... Just hope it doesn't go on before my warranty is up so I can get this covered - whatever's causing it. Let me know if you find out the root cause on your end.