Is there a term for when you suddenly do something wrong or get things mixed up?

I don't know if this is an Autism thing or Mentally Challenged thing or what but all my life since I was little I would have moments where I mess up badly. The best example I could give id like let's say I have a task to do. I have done this task almost daily for several months. I know exactly what has to be done. But despite that I might have days where I feel confused. I feel as if I never learned how to do this. I feel scared cause I don't know what to do so I either freeze up or do something wrong. There's no reason or trigger for this, it just happens randomly.

I tried to Google about this and all I get is either Mind Blindness or Brain Fog. It can't be Mind Blindness because reading into it, it seems to be about emotions or empathy or something, can't be Mind Fog cause that's apparently from outside and emotional influences and like I said, it randomly and very suddenly happens to me with no explanation.

It wouldn't surprise me if I might just need to see a doctor for this. I'm not sure if I should go over one little thing but at the same time, how long until I freeze up or get confused while doing something that would endanger me or others if I mess up? But I don't like using drugs for my mental issues, I don't feel like they're severe enough and I'm capable of teaching myself to function, to an extent I guess. But I suppose on the other hand, if this is just an uncontrollable issue due to the wiring in my brain maybe I might have to take something. I just want my first option to be to look into it and see if there's anything I can do to improve myself. At least then I can be more sure if I need to see a doctor for it.