In some instances the sliding screen door will fall out repeatedly because it is too small.
Sliding screen door stuck at top.
If the edge of the door is hitting the frame try tightening the screws on the top middle or bottom hinge on both the door frame and the door being careful not to over tighten and strip the screws.
Find the rollers at the bottom of the door.
Clean it with detergent and water or even a little solvent on a rag.
Locate the spring assembly which is often on the top.
Remove the plug and use a screwdriver to tighten and loosen the roller height making very small adjustments and testing each time.
If the track is bent or squashed straighten it with smooth pliers and file.
Determine exactly where the door is sticking before deciding on a remedy.
If it fits too loosely in the tracks any vertical movement of the door will cause it to come unseated and it will fall.
To fix this you can adjust the height of the rollers by the screws on the rollers.
Almost all sliding patio doors are adjustable when it comes to height.
First look at the lower track.
Most sliding patio doors have one or two small holes at the top and bottom of the door for adjusting the roller height.
Just opening or closing the door with too much force can warp the frame.
If your sliding door is sticking or dragging along the tracks making a grinding noise the springs in the rollers could have become loose causing it to sag.
Most sliding patio screen doors can be unstuck with a little maintenance.
Again this is a fairly simple problem to fix.