Lights flashing on dash! Losing power!

What is your question?

My lights on my dash flash off and on. Radio and AC will cut off and back on. Headlights will stop working then work again. One minute the Laredo is ok. The next the lights flash again. I notice when I hit a small dip in the road. Everything cut out but turn back on. I really hope someone know the solution. Only had this vehicle about two months.