Door locks making creaking sound

[macca]

I've adjusted a door striker and now I'm getting a terrible creaking noise over rough road. I think i've pinned it down to the door locks operating. How can I explain it - like solenoids being powered on/off very quickly, so not actually going far enough to open the doors. I think it's the doors because... 1. the sound stops if I open a door while moving 2. if I lock the car while moving it unlocks itself every time the creaking starts. Could it be the striker adjustment causing this (big coincidence) or are the solenoids about to go? Anybody experienced this? Thanks for any replys

[macca]

Nice one JFF, spot on, why didn't I think of that! I adjusted the striker because the door didn't always close first time. The position of the door was subsequently 1mm or so further away from the door switch and as the door moved slighlty on bumpy roads it must have been operating the switch. I'll have to adjust the striker again but this time I'll get a bigger piece of rubber between the sill and switch. Thanks JFF