Sounds like it could be 1 of 2 problems.
1) A wire came lose and that is why the door won't lock/unlock
2) Your automatic door lock actuator (motor) burned out prematurely and you need a new one. That should be covered under warranty
1) A wire came lose and that is why the door won't lock/unlock
2) Your automatic door lock actuator (motor) burned out prematurely and you need a new one. That should be covered under warranty