1999 Chevrolet Monte Carlo 3.1, dome light keeps flashing on and off after starting vehicle. How to fix?

Just recently changed the spark plugs, air filter, and pcv valve on my girlfriends '99 Monte everything went off without a hitch and seemed very routine. Minus the fact that after finishing up and reconnecting the battery the dome light flashes on and off after starting her car. The dome light continues to flash in a rythmic on and off pattern for about 1 maybe 2 minutes then stops flashing. Also stops flashing when ignition is turned off and key is removed. First thought that crossed my mind was that maybe one or both of the door switches were going bad. Not too sure though as this is a new experience for me. Any insight will be greatly appreciated!