Dodge Caravan lights come on for no reason

we recently purchased a 2001 Grand Caravan. The head lights and/or hazard
lights randomly blink on and off while the van is parked. It may last for
a minute or more. The last time the hazard lights blinked for 20 minutes
before we had to disconnected the battery cables. When we reconnected the
cables it had stopped.Has anyone had similar problems or does anyone know
what might be causing the problem? Also, at times we cannot open the back
hatch with the keyless entry. It will open a few inches and then shut
back. Any help would be greatly appreciated.
Thanks