Headlights won’t turn back on

What is your question?

Headlights will turn off if sitting in park too long while running, and then won’t turn back on when back into drive, even if I turn the car back off and then back on. And then today I sat a stop sign and my lights turn off again and wouldn’t turn back on.

How long has your 2004 Mercury Grand Marquis had this problem?

Few months