1996 Dodge Caravan Relay chattering

Electrical problem
1996 Dodge Caravan Two Wheel Drive 170000 miles

For the last 4 years, I would be driving down the road and a couple times per month (not predictable) would hear click-click, click-click, click-click (relay chattering) sometimes for a few seconds but there have been times it continued for several minutes. The light on the rear window defrost button would come on, I think headlights or parking lights would come on and maybe dash lights (not sure about that). Recently the symptom changed to, with the car turned off (key out of ignition) when the drivers door is opened, the parking lights and dash lights come on and stay on for about 60 seconds. The bell sounds to warn me that I have left my lights on - but the headlight/parking light control switch is in the off position. Any suggestions would be greatly appreciated