AssetBundles between Levels

I am loading most of my game assets through AssetBundles currently. However, I have some AssetBundles of textures that are used on multiple levels. It loads fine on the first level, then when it attempts to load the same AssetBundle on another level I get the following error:

"You are trying to load data from a www stream which had the following error when downloading. Cannot load cached AssetBundle. A file of the same name is already loadeed from another AssetBundle."

So, what I am wondering, is it possible for me to access the original AssetBundle from a different level instead of redownloading. If so, how is that done? If it is not possible, is there some way I have to clear out the old AssetBundles between levels?

Thanks