Error 244 with webdatablade

Hello, Question first, Details follow: Are there any other reasons known than described in the Error Message which might lead to Error 244 ? Details: We are developping a website using the webdatablade with IUS 9.12. While the Database is growing, the database requests of the Webdriver *randomly* deliver Error 244 Could not do a physical-order read to fetch next row. After a reload (or two) of the browser, everything is ok. There seems to be no table or index file corruption according to oncheck, neither are there any operating system messages about hardware problems. What else might temporarily prevent a 'physical-order read to fetch next row' ? Thanks in advance Klaus Voss