Spoiler warning light

[Dandan]

I need some advice regarding the spoiler warning light. I have done a bit of research on various forums but can not seem to get to the bottom of this annoyance.
Light comes on intermittently while I am driving the car. The spoiler remains operational with the under dash button. It will go up and down while the light is on.
If I turn the car off the light goes off next time the car is started. It comes on after I drive the car for a while.
I checked the relays, fuses, cleaned the switch.
Not sure where to go next.
Is the microswitch in the trunk possibly defective?
Is this a speed sensor problem?
I have no codes on my OBD reader.
Any thoughts?