Strange Problem

[inmnbob]

I have an input problem that i need some advice on. When I type an email the system works well until I type a word that gets auto corrected... It seems like everytime i type a period (.) followed by a small i the system corrects it to a capital I and then the text I type after that doesn't show up but the cursor moves. If I close the keyboard and re-open it the text appears and I can type until it breaks again. Once again if I close the keyboard the text appears and works. I had Sprint replace the keyboard for me today but no luck.

Ideas?