I'm checking around and they say that problem probably lies in the application S Pen Keep, there is no data on this one ... I guess as you said it's linked to the handwriting recognition. tried to do that using Snote transform into text as well and it immediately stopped working as well..
mine got fixed by formatting and wiping, re-download another stock rom I guess yours has some form of data missing ..
@Colide , just go back to factory settings , will resolve the issue, do it from the recovery of course.
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