I have many friends and hence I send and receive chats, pictures, videos etc.
Recently I cannot contact only one person out of the whole lot.
The moment I am going to whatsapp and when I am touching that person's contact both in the chat and favourites, within one second, I am out of whatsapp into the main menu.
I can use whatsapp to contact and receive all others except this one person.
Could you please revert as if why this happens.