Since the Survey123 field app v3.13.229 release our larger surveys are freezing up and failing to submit on mobiles and tablets. The loading time of the survey has increased significantly as well. No issues with smaller surveys. We have devices (iOS and Android) which are still running v3.12.277 and these still work fine. On one device we tried before and after the version update and it worked before, not after. I have made a copy of the xls form and simply deleted half the lines in the sheet (1500 down to 700 roughly), republished the survey and it managed to submit, so it seems to be struggling with large surveys. I have reverted back to 3.12.277 on my Android and can now submit again.
We have external contractors using these surveys and have asked them to revert back to 3.12.277 to get it working again but this is not an ideal long term solution.
The feature layers are published and hosted on AGOL.