Failed to load resource in Product page.

[Zio]

I am using VirtueMart 3.0.8, Joomla! 2.5.28.
My products page has this issue(as attachment)often, the page failed to load some resource and also the styling is gone, only left the html structure. I open inspect element and looking into console, it say "resource: the server responded with a status of 500 (Internal Server Error)".

It only happen in my products page, the other page is fine.

Do anyone know what cause this issue?

[GJC Web Design]

you need to find out what that 500 server error is  - plenty of posts on here about how