Random announcements not changing on refresh

I've set up an announcements module in a sidebar to display one random item. This sidebar appears on most pages and when you visit different pages the item changes as it should. However, if you go back to a page you've previously looked at, the item is the same as it was when you first visited that page and doesn't change no matter how many time you refresh the page. I assume the browser is caching the page, but shouldn't the item change on refresh? Is there a way to force it to change, particularly if you've gone away from the page and come back to it again?
Here is the code I'm using for the tag:
{module_announcement filter="random" template="/ModuleTemplates/Testimonials/custom.tpl"}
Any help is appreciated.

BC has commented on this before - It is to do with performance caching. When your viewing and testing and reloading many times etc - This is not a real world live example of a persons use. So it may be the case you not see the item updated. Go to a different browser and you will very likely see a different one.
The other factor to also consider is the number of items - If you only got 4 items then the likelihood one will show up over and over is very high.

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Message was edited by: Hooohn; spelling corrections only

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