Very weird problem

I have a 1996 Dodge Caravan 3.0 liter engine, 161,000 miles, my door ajar light flashes off and on a bell/chime dings repeatly, sometimes my inside lights flash and my door locks continue to lock, all this happens at the same time, sometimes a bump in the road starts it all happening, slamming my drivers door sometimes slows down the problem, at first seem like only wet weather caused it to happen but now it happens all the time. What could be my problem? Thank you in advance. Potluckterry