With mine, my thinking was that if the spoiler was "Snapping back up" as it appeared to be doing... I would have heard it hit the stops... so I paid attention the next couple of signs I went under and the way the reflection ran accross the spoiler, it looked like it dipped, and snapped back up.. a few signs later, I confirmed it...

Not saying this is your problem... but I hope so... I know I was relieved.. LOL

Good Luck