Than you Susan.
I repair cell phones - i phones every day so not a problem. Probably a worn or slipping gear as the electronics respond with a passing train. Gate just wont go down and cant be forced down either.
As you can see, the sidewalk and scenery area will have to be compromised. Maybe some day I'll get to it? LOL!
I believe you may have discovered the problem on your own. I have had to go in and simply super glue a couple of the slipping gears back in place. Once I have done that they haven't come out again. If you hear your gate making noise, all may not be lost. Let us know if that works.