Out of the blue my ABS & track off lights on my dash come on,
but they go out when the computer resets itself by turning car off and on. Do I have a computer sensor going out?

 

What year and make is your vehicle. This will help in diagnosing the issue. If its a 97 Grand Prix GTP, it will mostly like be a wheel speed sensor, in which case I would check the wires and hope it's not the sensor cuz it costs a couple of dollars to replace.