Problem with document preview

Hi all, 

We experience some weird behaviors in preview tab. Sometimes documents just changed are not re-rendered. 

We have in some cases properties used in metadata placeholders. When changed them and save, those changes are not applied to preview mode. 

It is strange because it seems if document is clicked and previewed for longer time, the document content is cached and is not re-loaded anymore.

Is it possible to re-load document always so preview will be rendered always with latest properties?

If checking-out or even opening document in read-only mode, latest properties gets applied. In preview however it does not work when document is cached.

Does anyone has suggestions about this?

Best,

Dejan