Ok so I have used Survey123 since its original Beta and there have been huge improvements. This past week was the first time I have used it in production in a larger scale, collecting about 250 surveys. I am doing some post processing of our data and I am noticing several duplicates. Some are complete duplicates of all data including the exact same times where the data is the same but some of the attachments are missing.
This is much better than loosing data (though I do have 1 survey that never seems to have shown up but could be user error). These all have at least 5 attachements and limited to Large size in the survey. The user who uploaded did say each day he would upload on wifi at home and of the 50 surveys each day a few would fail and he would resend them. I am guessing these are those.