I think I may have solve this problem. At least on my phone. On the suggestion of my nephew, who's a tech wizard, I downloaded the Google keyboard from the play store. I switched over to that as defalt instead of the Samsung keyboard. I have NOT been able to duplicate any of the errors I was getting before. Problem solved. At least on my phone, and my wife's. Bonus being, I find I like Google's keyboard way better than Samsung's. Give it a try. See if it works for you.
Below is my previous post when I first start experiencing these problems:
I've been getting an error when typ