I just downloaded the crash reports for one of my iPhone apps from iTunes Connect. The most common crash has a trace like the following:
Exception Type: EX
I recently had a similar problem where my apps were crashing randomly. Turns out the problem was in using "onclick=" in the loaded HTML.
onclick=
Replaced the onclick with simple and the problem went away.
onclick
Hope this helps others who are experiencing the same issue with webviews.
webviews