Hello, welcome to the Samsung Community. I understand your frustrations on your Samsung Keyboard not working properly and I will be more than happy to take a look into this with.
If you are experiencing issues with the keyboard closing when you're typing, you can try adjusting the sensitivity along the edges of the screen.
Close all the running apps on your phone or tablet. Then, navigate to and open Settings. Tap Device care, and then tap Optimize now. This will close any apps that are running in the background and optimize certain settings.
Restart your device
Clear the Keyboard Cache and Data
Navigate to and open Settings
Select Apps
Scroll to and select Samsung Keyboard
Tap Force Stop
On the same screen tap Storage
Tap Clear Data, all of your keyboard settings will be erased including any saved words
