Im guessing you've got a GT Auto Spoiler, i got one to, on my R32. The spoiler will only come down when your not in gear and your hand brake is up (i'm guessing this is so you can wash it when your car is parked). The only other time the spoiler will come down is once you have reached and gone over 70km/h (listen for a electric motor sound soon as you hit 70km/h and thats the spoiler coming down), it will automaticly come back up once you have slowed down to 50km/h or slower. You can lock the spoiler so it doesn't come down by pushing the 'spoiler up' button and it will not come down automaticly any more and the button will stay stuck in, if you push the button again it will pop out again and go into auto mode but if your going over 70km/h and you just disengaged the lock mode, to put it back down you have to push the 'spoiler down' button. Turn your radio off and listen to the spoiler activating and deactivating by going over 70km/h and then slowing down to under 50km/h, its pretty cool
Hope that explains your question