I have a calculation column that I use to display some HTML code that provides a hyperlink in a List view. The user clicks on the hyperlink to jump to another page which will generate a report based on the ID of the item:
It all works fine, however, on random occasions, the ID field is calculated as empty, so the link goes to the page but the wrong report is shown. The only way I've found to fix the issue is to open the calculation column, replace the '&ID&' with '&[ID]&' to make SharePoint re-examine the whole calculation and put in all the ID values. It last about a week and then has to be done again.