We've had a number of people have the situation where they have gone to submit surveys and S123 says it has failed, they submit again, then we find duplicate records in the feature layer.
We have a feature service hosted on AWS servers and registered on AGOL.
It's not repeatable and I haven't had it happen on any of my tests, but we've had a number of people in different areas had it happen.
We currently rely on a scheduled task to look for duplicates (using S123's unique id field).
It may have to do with photo size and internet connectivity and we've reduced our photo size to reduce the risk.
Has anyone else experienced this?