In a workflow we use web service lists.asmx with method UpdateListItems to create an item in another list and later on to update this item.
This all worked fine while testing on Preproduction and for four weeks after go-live to Production.
A week ago the web service started to work only intermittently. Some items can be created while others fail.
The web service is configured to capture errors but it does not throw any error when the item creation fails!
I tested capturing errors with forbidden character in the item name and these errors are captured.
Since the web service does not throw an error when it fails to copy the item I don't know how to fix this.
Does any of you have an idea why this fails?
If you need more information e.g. web service soap xml please let me know.
We use SharePoint / Nintex 2010 (v188.8.131.52 - International).