Happens frequently, first time using in a while. Hard to diagnose and hard to replicate. I don't think it is a certain form element, although it has happened to be on multiple choice and dynamic fields so far. I also don't think it is form specific, I have created new forms since the newest version and still had the crash. Reopen and everything is fine, no more crash..
Keep trying to replicate this bug, safety culture, try to use a different iPad 3 than the one you are using.