Hi my GMC Yukon wouldn't crank up tonight. I tried jump starting it and nothing. Went and bought a new battery and still nothing. No lights nothing. Tried jumping again with the new battery and it started right up. As I was driving down the street on my way home the lights started blinking., the doors started locking and unlocking on their own and the car's engine started to fade in and out. When I finally made it home after stopping several times without shutting off the engine and I turned off the engine everything went dead immediately. I have not tried to jump start it again yet. This all started tonight with no warning signs. Any idea what is going on?