Where Your Whatsapp Is Alway Hanging, There Are Step You Need To Take That May Be Causing It.... Two Steps:

(1) Go To Your Memory Card Or Phone Memory, ENTER Your Image,Music,Video Folder, You Will See WHATSAPP Image,Music,Video As The Issue Maybe, Enter The Whatsapp Folder, Delete Or Move All The Files You Find In The Folder To Your Memory IMage,Music,Video Not Whatsapp Image,Music,Video, Just Put It In The Memory.

(2) Second Step Is To Go To Your Whatsapp Settings, There You Will See WHATSAPP History, Click To CLEAR ALL History Which Will Clean All Your Previous Chat Before BUT Your Contact Will Remain Intact.
Doing This Reduce Or Free The Memory That Is Consume By Whatsapp Media Thereby Stopping Your Whatsapp From Hanging And You Can Continue With Your Chatting. Its Advisable To CLEAR Your Chat History Every Month Depending On How Active You Are On Whatsapp Application. Leave A Comment If The Information Have Being Helpful To You Or Your Friend. I'm Sunday Osighwe