One problem related to headlights turn off while driving has been reported for the 2008 Chevrolet Trailblazer. The most recently reported issues are listed below.
I was driving down the highway and my lights just went off. The interior lights were on but the headlights went out. I stopped the car, turned it off, waited a few minutes and turned it back on. The lights did not come back on. The high beam lights still worked and I drove home with my brights on. When I got home and turned off the car I tried them again and this time they came on normally. This is the third time this has happened at night that they just went off.