I guess there are different modes for the Spoiler.
1. Automatic Up and down as described before.
2. Manual up while moving above 35 and less than 65...and it will go back down automatically. I think it matters how long you hold the up button in this mode.
3. Manual Up at less than 35 and it will remain up...until lowered manually and confirmed by the beep.
At least that is the way I remember the speeds and functions....;-)