I just came across this tip sheet from the App Quality Alliance, or AQuA, and I found it to be a concise set of 10 mistakes you should avoid when developing your mobile application. The worst of these would definitely be the app crashing without warning, in my opinion. Even if you avoid all the other mistakes listed above, if your app is always crashing, no one will use it.

You check out the full list here http://solutions-review.com/mobile-a...-errors-avoid/