Dear Samsung Member,
Greetings from Samsung Customer Support!
Kindly be informed Whatsapp is a 3rd party application which is not from Samsung. As we are trained to handle Samsung software and hardware related troubleshooting, we advise you to contact to the respective application software support. You can reach to the app developer through email channel go to: Play store > select more option> select installed app> click on read more.
You can try after clearing the app cache by following below steps: Go to settings > Apps > More option > Show system apps > Select the application > Storage > Clear cache.
Thank you for writing to Samsung.
Samsung Customer Support