So sorry I didn't see this post until now! Congrats on your Aria 4000! The doorsteps should have a switch to leave them "down" if you don't want them cycling in and out every time you open the door (usually when you are base-camped). The switch activates via the screen door-no, we don't have any gaps so your door may need adjustment.
Our coach needed a lot of warranty work over this Winter and we got it back a month ago. It's a wonderful coach-we just have to get through the growing pains all RVs have in the beginning. Thanks for reaching out-please do so anytime and I'll try to pay better attention!