Hi
@Whiskers184
It is common, in my limited experience, for a PWD dementia to start to have memory problems, so they often write notes to themselves. Then they have difficulty writing clearly. Then they have difficulty reading the notes. Then they have difficulty remembering what's in the notes. Then they have difficulty remembering there is a note. Then they stop writing notes. Then they stop writing anything or lose control of pen or pencil. They lose interest in reading because they can't remember what they've read, so they stop reading.
My OH has forgotten how to use a phone - both in answering a phone or making a call. She doesn't know where her phone is, which makes no difference because even if she knew where it is, or actually what it is, she doesn't know how to use it anyway.
Prompts and reminders stop working.
My wife has forgotten how to open our front door and thus, the good thing is (and you always have to look for and think of the good and positive side of everything if you can!) that she won't wander off out of the house.
You have to learn to accept that it is as it is.
Best wishes