Intermittent dash lights

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My wife has a 2008 Saturn Red Line Sky. she is having trouble with the dash light coming on then going off. Then some time they will come on and stay on for a period of time then go off. Have taken it to different people and they can't find any thing wrong because the light would always come on . Then after we pick up the car after a couple days they would go off again. Kind of hard to see the gauges when it's night time. Thanks Steve Newman