I am working on a map too, that has a lot of command blocks and it completely quit working except the commands that are activated by red stone. If you want exact details read on. I joined my realm and was surprised to see that I was in the same place that I disconnected from (I have commands that teleport players who left and then rejoined to spawn). I went to check on the commands that teleport the players, there seemed to be nothing wrong with them I tried turning them off then on (that fixes most problems) it worked. I went to do whatever I was doing, and then I noticed that nothing else was working right. so I thought that I would need to turn off and on all of the commands (a pain). so I naturally asked one of the other people who was working on the map to do that. It seamed to fix the problem until he was about half way through, they started to quit again. I had a back up that luckily wasn’t very old and 1.14.1 had just been released, I thought ok it must have been corrupted when it updated. so I up loaded the back up to my realm. One day later same problem. Until this is fixed I am only working on single player. Thank you for reading this.
At least they didn't up date commands again. That was worse than this.