I had two major systems failures in one day (to very important items) Since I built those things and have the tools, I got them both repaired the next day.
I was very lucky the front door failed for the last "opening" of that night.
The problem seemed major but was just One Screw sticking down about less than 1/16th of an inch,catching the steel frame.
The way it held against my jerking and pushing, I assumed it was like a 5/8 inch steel bolt stopping it!
Amazing how strong such a tiny molecule of steel might seem to be.