I have heard a beep beep beep in quick succession before. Did it sound like that? That usually goes off when the back in steps out (when driving in snow or wet grass). Could be a sign that whatever sensor that uses is going bad?
I'm assuming it's cold in Maryland right now. Mine does the same. Think it just has something to do with the cold and have heard others talking about it on here as well. As long as it runs smooth like mine once it starts I wouldn't worry about it.
The jiggle valve is exactly what it sounds like. A little jiggly piece on the front of the thermostat. It allows air to escape the engine block and make it's way to the top of the radiator to be expelled.