Thanks for sharing what you're going through with your son, its sounds like this must be pretty confusing for you. It can be quite shocking when someones behaviour changes, and it can seem to come out of nowhere. Could you give an example of some of the things you've asked him to do that he isn't doing?
I'm wondering about what happens when you try to bring this up with him? Have you been able to have a conversation with him around what you've noticed and the concerns you have?