Error writing data from Appian prpromemory to PDF

Question

Hello! 
 We are using on-premise Appian version 7.5 who is acting very strange. We have a long process and at some point we fill a form with data. Later on, we do some check and we want to write the data to a PDF file, but some fields aren't written (not all the time). We see the variables with data, but somehow this data isn't written to the PDF and this is random. 
 Any ideas what could be? Can it be the server setup?

ChristineH · Accepted Answer

So if it is random meaning in instance A fields 1,2,3 are written, but in instance B only 1 is written, it could be a number of things. I would first check the logs for more info. Also, if you restart that node, do they write (edit model instance first if prod to not go on to redo other processes). 
 
Some reasons might be: data size or timing or race conditions for population or ....