Bulk image file uploader crashes all the time

This is not just a fault with the current WP release as I have always had this problem.

When I upload a batch of image files into my gallery for a post, the bulk file uploader seems to crash all the time. Sometime it will work for a handful of files and then it just stops. This proved a major pain in the back side as it takes me a long time using the alternative file by file method.

Please can anybody suggest why I might be experiencing these problems.

Many thanks.

Yann