I've written an application using Xamarin Forms with the ArcGIS Runtime 100.1 on iOS I'm seeing the map freeze when rotating from landscape to portrait or when the map is resized, this does not happen on Android or UWP. This is notably easier to reproduce when location is on. I've written a sample app which reproduces the behavior. I'm not sure if this is related to having two maps in my application or not but I've included this feature in my sample.
A work around or patch would be greatly appreciated.