I think it often takes me a lot of work to assemble a plan to cope with a particular set of circumstances, and if the circumstances then get changed, it's then hard to make modifications quickly and effectively. There's often something quite delicately-balanced and complex about my coping plans, something very static and rigid. Neurotypicals don't plan so much, they're more likely to wing it, and their minds are more flexible so they can more easily adapt to changes.
I remember when I was tasked with synthesising a protein at work (science research job). It was quite a complicated task and I knew I was going to have to perform it many times. There was no clear, detailed set of instructions around that I could have immediately understood and followed, so I set about writing my own instructions. They were much clearer and way more detailed and specific to the actual steps of what was done, and it took me several days to complete and perfect them. It was a very long document but it was possible to just start at the beginning, carry out the steps like a robot, and get the result with hardly any other thinking at all. I couldn't understand why they hadn't given me those instructions in that form in the first place. But nobody else thought it should be necessary.
But then, changes started to happen. Somebody moved a few of the materials to different storage places. The rules about how and when to book a communal machine changed. My method soon became out of date, and I was quite annoyed. It took a long time to update the guide, and as fast as I updated it, along came another change to throw it out of kilter again.
I'm always creating verbose step-by-step guides like that for myself. It's almost as if I'm expecting myself to wake up tomorrow incapable of remembering or deducing anything "on the hoof," so I write these robotic instructions to make sure I can still function. A lot of them are about computer tasks, which can get very complicated and clever, and if I don't do a particular task for a couple of weeks, it's like a blur when I do have to perform it again. In practice I tend to do rather better than I expect myself to do in the absence of those step-by-step guides once I've got over the initial shock and confusion, but sometimes I find I can't repeat what I was good at only a few days ago. And if I have to use a different computer, or the operating system or whatever gets updated or modified so that the conditions I'd depended on to be fixed have become different, that too can throw a spanner into my works.
So I think the change problem has a lot to do with rigid thinking styles and certain differences in the way our memory works.