title: Xamarin Android app crashes on Release mode
body: <p>Several months ago I updated Xamarin to 4.5.0.476 (Xamarin Android 7.3.1.2) and today, updating an App, I discovered that I cannot run my apk in release mode because it crashes when runs. And I can't understand why.</p>
  <p>I tried to set all type of permissions on the android manifest.<br>
  Linker setting is <em>SDK Assembly only</em> but I also tried <em>None</em>.<br>
  I cleaned and rebuilt several times.<br>
  There's not conditional code that can fail on start-up.<br></p>
  <p>Nothing, app always crashes when opening main activity.</p>