What do you do if randomly, without explanation, your father cuts you off, doesnt answer the phone, doesn't reply to messages, but several months later treats you as if nothing ever happened. He also does this to my children, he will not acknowledge their birthdays at all, but then never mentions it later. I suspect this happens when he's annoyed at me in some slight way.
This has been happening on a haphazard basis for 13 years.
For info- I'm an adult with teenage children and my father is 70. He is not with my mum since my late teens. He doesn't do this to my 2 sisters, but hasnt been in contact with my brother since he was a teen (for similar reasons).