Intermittent Power Side Door?

Ok so this seems to be a recurring theme with my recently imported SCL: things working "intermittently"

This week's flavor is the powered side sliding door. I'm not sure how common of an option this was on these vans, but mine seems to have a mind of its own!

Basically when I hit the open button on the dash, the door might slide open, or it may not. (it should be noted the buzzer sound goes off regardless).

If it does open, then I have no trouble getting it to close with the button too.

I've assumed the van has to be in Park in order for it to work, which I've been doing but it still won't open every time.

Anyone else had this issue? Is there some special sauce secret combination of steps I have to follow to ensure it does open? This isn't a "necessary" feature of the van, but it sure is embarrassing when I tell my friends that it has an power-side door and then it decides not to work that time lol

Sounds like the door contacts, make sure they are clean and oiled a bit. ACF50 is probably a good choice.