Solution; stop using WhatsApp make calls!
In a age old business tactic to eliminate their competition Facebook purchased WhatsApp! Since then they have been making WhatsApp malfunction so users will become frustrated and go back to using Facebook!
I recently heard that WhatsApp announced that they were shutting down all of their plus accounts in a letter to the account holders.
Facebook is slowly chipping away at WhatsApp and sooner or later they will shut down WhatsApp completely!
The only suggestion I have is to start looking for a new message app to use.