I have a 2006 Dodge Charger HEMI

I have a 2006 Dodge Charger Hemi. For the past couple of months while driving the gauges are going up and down. It also causes for the air to turn off doing this time. Some days it does it like a few times but other days it does it more than 20 times. The dealer wont help and I need to know what this problem could be. Can someone please help me. I'm a woman and I need to fix this issue.