I have a 99 Ford Focus and the back passenger door central locking has stopped working so I have to lock and unlock the door manually. Another thing with the central locking is on cold mornings, it will lock and unlock itself when driving. Always seems to be fine overnight though because I've never come out to it in the morning and it's unlocked itself... only usually when I'm driving it.
I also have an intermittent problem starting the car. Sometimes when I turn the key, I just get a clicking noise and all the dials max out. Engine doesn't turnover or anything. I've changed the battery and the grounding was checked a few months ago when it started happening but it can be fine for weeks at a time and then start playing up again for a few weeks.