Just to clarify, you no longer are able to send surveys existing on the device to the feature service? Are you getting an error code or message? Was a change made to survey via Connect that changed the schema? Or is it that you just want a copy in CSV on the device, as well as submitting the survey to feature service?
You can find help documentation about recovering data from a mobile device here: Troubleshoot—Survey123 for ArcGIS | ArcGIS
If you are still having issues and are unable to submit the completed surveys by following the steps outlined in help documentation website, we can take this offline and to discuss the other options to recover the data.