There are two switches: one that activates when the bank is all the way up and one when it is all the way down. Maybe the down switch is flaky or needs to be adjusted?

I thought the visor works off the other switches on the game once opened.

For example once you open the visor it remains open until 2 balls lock. Then it starts multiball. Visor stays open until ball is locked. Then timer starts for you to collect jackpot by hitting the ramp with the other ball. During this time the visor closes as the timer runs, then opens if the jackpot is collected or timed out and releases captured ball. Stays open until cycle is continued. If you lose a ball and end multiball it will remain open until a switch is registered. Then it will close and start the light sequence.

That's how mine works.

Mine does this same thing (down then up then down). They appear to come to a complete stop just as the sound effect ends so I just assumed it was just the way it ran. I have never seen one that did it another way but I haven't played them all of course.