My mazda 3 2005 has started to lock and unlocked itself several times while I am driving and when not in it. Any suggestions what it could be ???

Thanks

 

wiring issue, likely a wire being rubbed to ground, though that doesn't seem likely only after 7 years... I doubt that an open wire connection would do this, but i'd have a look at the front doors wiring - the flexible part between the frame and the door - to see if there's anything obvious there.

then again it could be simple corrosion, I know a few people that have had corrosion on the PJB (passenger junction box) connections cause a handful of different problems. And yours is about the right age for that to start if it's the issue.