Interior lights on intermittingly
 

Last night during a drive home, the interior door and overhead light came on in my 2003 base Boxster. We stopped to check that a door wasn't opened, but that wasn't the issue. I manually turned off the overhead light, but the door lights stayed on, then out, then on again repeatedly.

When we arrived home, the lights went out, but when I went to take something out of the console, opening the door triggered the lights again and they stayed on.

Any advice?