Asset bundles manager memory leak on iOs

Has anyone experience memory leak on iOs with Unity AssetBundles Manager and found solution how to fix it? My case, i load empty scene where i have 20 mb of RAM memory. Then i go to another scene, load assets, instantiate, then destroy everything, unload asset bundles, call Resources.UnloadUnusedAssets, return to previous scene and have there 25 mb of memory. Where i get this extra memory?

You might have better luck posting on the iOS subforum.

I will post this question in another subforum. Please, delete this post.