More central locking problems

[mattyboy]

Posted on here a few days ago that my central locking on the 2 front doors was playing up working on and off,but now but front doors wont lock or unlock with the remote or by using the key but the 2 rear doors and boot are fine with the remote and by using the key in the drivers door, it just seems odd to me that both doors would pack up at the same time  :-? Had some advice that sometimes the grease inside the door on the locking mech in cold weather hardens up so the motor cant move the rods up and down so took door cards off wd40 them but still nothing    Am i just unlucky here that both front door motors have packed up at the same time   or is there something else?