Samsung predictions lost

Hello,

I've had the S4 for about a month now and it was all working out great until Thursday... Not sure what happened there but I was very happy with the Samsung keyboard and the predictive text and all of a sudden all the words I type on a daily basis (names, etc...) that were not originally in the dictionary simply disappeared...

I haven't installed any other keyboard app and I don't believe I downloaded or deleted an app around the time that happened.
Even right now it still does not remember the text I type in anymore (or just for a couple minutes sometimes).

Predictive text is still set to "ON" and I haven't changed the language or anything...

Any help appreciated. Thx!