No lights..help

I have a 2003 Sierra that has automatic headlights. This morning (dark/cold) when I started the truck no lights came on...manually switched my console lever to brights...had brights....switched back to low beam ...no low beam...did it two more times then the low beams came on and stayed on ffor the drive to work. Is it Light? Relay? Other?

sound like a dodgy switch to me