I told my dealer about this and the temporary solution for them was to put a screw in to keep the door down. I'm sure they will come back soon with a permanent solution but I am a little more relaxed knowing my pumps aren't going to burn out from pumping air.
The reality is if designed well there should be a bypass so water is drawn in anyway when the door is in the up position so your pump shouldn't draw air. That door is really a skimmer and when it doesn't go down all you should loose is the skimming action (important in a pool, really no biggie in a spa). Get it fixed obviously but I would hope you would not see pump issues.
Its probably just misaligned as plastic can move, warp, etc. over time in hot water. Adjusting it or taking it off/putting it back together sometimes is enough to do the trick but have the dealer come out and take care of it by either aligning it or putting on a new one.