This has also happened to me since the Stagefright issue patch applied to them by a recent update by Google to my Nexus 5 and Nexus 6 phones. Also note that both of these phones worked when they were using ART runtime before the patch.
ART is a feature of Android lollipop that replaced Dalvik entirely. It cannot be turned off. I'm note sure the Sophos response is valid because of this.
This has also happened to me since the Stagefright issue patch applied to them by a recent update by Google to my Nexus 5 and Nexus 6 phones. Also note that both of these phones worked when they were using ART runtime before the patch.
ART is a feature of Android lollipop that replaced Dalvik entirely. It cannot be turned off. I'm note sure the Sophos response is valid because of this.