It depends on how you are using the word "template."
After you make a Quark document, you can save it in two ways. One as a document that works the way a document should, and the other as a template. Upon reopening a template, a new, untitled copy of the document will open, leaving the original template unchanged.
D3006:but when they open an existing templete that have been using for over a year
This suggests to me that they are using the same document over and over, opening last weeks, changing the content, and resaving, only to do it again next week. After a while, a bug can get into the doc and make it unworkable.
It may not be possible to fix this doc, but suggest that if they are reusing documents, that they should look into using actual templates instead.
If I got it wrong, can you tell me the difference between a new template and an existing one?