[AT&T Samsung Galaxy S 4 Q&A, Help & Troubleshootin] duggerdude:
So after talking to samsung i thought id share some info with all of you who might be having issues with the samsung keyboard not remembering words or forgetting them. here is a chat transcript.

Ken: Hi, thank you for contacting Samsung Technical Support. How may I help you today?

Visitor: my samsung keybord on galaxy s4 has alzeimers

Visitor: i turned on auto replacement and predictive text and and now my keyboard has alzeimers

Ken: I understand that you are facing issues with the device Keyboard. Is that correct?

Visitor: ive tried turning both those off

Visitor: ive "learned words" from messages and facebook multiple times

Visitor: and verified that that learning went through however it forgets them almost instantly

Visitor: when i first got my phone it remembered my email address everywhere

Visitor: now i have to enter it out fully

Ken: I understand that you want to enable dictionary in your device. Is that correct?

Visitor: yes yes i do

Ken: Thank you for confirming.

Ken: Not to worry, I will help you in this regard,

Ken: May I know the model number of your phone ? You can find the model number beneath the phone's battery which generally starts with SGH, SCH or SPH .

Visitor: you should enable an actual personal dictionary like all other keyboards have where you can manually enter words and save them

Visitor: sgh i337

Ken: Thank you for the model number.

Ken: Let us perform few steps in the device and then check the result,

Visitor: ok

Ken: From home screen tap on app's >> settings >> My Device >> Language and Input >> Samsung Keyboard >> there enable Predictive text in the device

Visitor: i already did this this is actually where the problem started

Visitor: im bypassing your steps i went to settings> app data>samsung keyboard and and cleared data

Ken: To confirm have you performed Clear Data for the Samsung Keyboard in application manager?

Visitor: yes

Ken: I want to inform you that performing Clear Data in the device will delete all the stored words in the device.

Visitor: there are no stored words

Visitor: any stored words

Visitor: are getting kicked out about 10words afterwords

Visitor: for instance if i store duggerdude@********** (my email)

Visitor: then i store 10 more words

Visitor: duggerdude@sbcglobal.net is no longer stored

Ken: Please enable Predictive Text in the device and check the result.

Visitor: it is enabled

Visitor: it has been enabled

Visitor: and after the clear data i made sure it was enabled

Visitor: their is bug within the dictionary

Visitor: thats not allowing it to store more than a certain amount of words

Visitor: also learn from under predictive text doesnt work even though it says it works it doesnt work

Ken: May I know from when are you facing this issue?

Visitor: since whenever my phone updated to 4.3

Visitor: so samsung keyboard and 4.3 dont like eachother very well

Ken: Thank you for the information,.

Visitor: i have a contact by the name of kyrsty and i go to predictive text> learn from contacts and it still wants to change her name to kirsty

Ken: I want to inform you that the device is not compatible with storing words in the device after 4.3 update.

Visitor: oh so the 4.3 update did take away features

Visitor: will it be compatible with 4.4?

Ken: I am afraid yes.

Ken: I am sorry to inform you that we in live chat do not have the information about the future update for the devices.

Visitor: let me rephrase

Visitor: i have a sprint s4 lol

Visitor: which just recieved android 4.4

Visitor: is it compatible with storing words

Ken: As the update is not yet released for S4 devices we in live chat do not have the information about it.

Visitor: bs sprint just released the update for their s4

Ken: I have searched information for you and there are no official update available for sgh-i337 to Kitkat.

Visitor: not for sgi i337 no

Visitor: sgh*

Visitor: the sprint s4

Ken: I am sorry for the miscommunication.

Visitor: i do have att but since sprint just released s4 update

Visitor: im hypothetically asking

Ken: Kitkat android is available for SPH-L720.

Visitor: will the keyboard store words on the 4.4 for that phone?

Visitor: if it does its likely that it will for this one as well, possibly not, but likely

Ken: I want to inform you that the feature to store the words in dictionary is available in 4.4.2 update, however that is a carrier specification in device.

Visitor: ok

Visitor: ok

Visitor: did the 4.3 not work on that phone as well?

Ken: Yes, the option was not available for 4.3 update in Sprint device as well.

Visitor: i see a pattern.

Visitor: thank you

Ken: You're welcome. Is there anything else I can assist you with?

Visitor: you have been very helpful

Visitor: and hopefully att stops dragging their feet and rolls out 4.4 soon

Ken: I understand your concern.

Visitor: have a nice day