if you have webViews with html content within a scrollableView, they will disappear when you scroll through the scrollableView. CacheSize of scrollableView does not have any impact to this issue.
You can easily reproduce this issue:
1. Create a scrollableView
2. Create 10 Views with a webView in it (put some html into the webview)
3. Put the views into the scrollableView
4. Scroll forward and then backward through the scrollableView
5.0.0.GA / 5.0.1.GA / 5.0.2.GA, iOS9, xcode 7.0.1