Autism or Neurological Problem?

Have you ever seen anything like this before. This is how Gavin writes now. It never used to be like this but as of late this is a very common occurance and dominates the way he writes. I don’t know if this something related to Autism but I think this may be more of a neurological issue. I getting more and more concerned about this whole neurological thing. Gavin starts out writing using most of the page but a few lines later he begins using less and less of the page until he’s whittled it down to only one or two words on each line. I fear this is another emerging symptom pointing to some sort of a neurological disorder. Does anyone have experience with something like this? If so, what was causing it? It’s not a writing style. It’s more like a perceptual thing. I do know that he doesn’t realize he’s doing this. I’m worried. Very worried. Any advice would be appreciated.