Shifter Power lock Sensor

When you put the car in drive it will lock the doors. Now everytime I hit a small bump it tries to lock the doors. Is this something that would be easy to fix? What do I need to be looking for?

You need a new switch and or sensor for the power door locks you need to provide more info such as year and miles

year is 2000 mileage is 85,000. I got the Haynes repair manual but could not find anything on the sensor/switch or how to replace them.