We are using Nintex forms and workflows in our SharePoint 2016 environment. We are randomly facing an issue with Responsive Nintex task form having more than 2 or 3 attachments, after submission, the task completes. However workflow goes to Error with error message in the history:

The workflow could not update the item, possibly because one or more columns for the item require a different type of information.

Note: this error happens intermittently, so we are unable to replicate all the time.Type of file attached: can be any file even .txt file.