Kindly follow the easy troubleshooting steps which might help to solve the issue.
Go to Settings >> Tap on General Management >> Tap on Language & Input >> Tap on Samsung Keyboard >> Tap on Reset Settings >> Tap on Clear Personalized Data >> Tap on Reset Keyboard Settings.
In case the issue still occurs. Please register your concern in Samsung Members Application (Open Samsung Members Application > Support> Tap on error report > Type your query > Send).
