No limit, and even if there were you would still have the content up to the limit, not a blank entry.
More likely that the clue is in your words “I sometimes (RARELY) spend ages adding details”. Perhaps a time-out on the server?
You’ll need to look for something happening in the server (not kiwitrees) logs at the same date / time as the issue.
Are you sure this has only happened since 3.2.2, or possibly that it is only recently that you have “spent age adding details”? I ask becasue no changes were made to any part of the CA code for 3.2.2 that I can recall.