Just upgraded Unity to latest stable version 2018.3.0f2 and started running into a logcat error on build (yet not in editor). After spending the day trying to track down the issue with no luck, I did notice that Unity have now marked Unity.WWW as obsolete with the following warning.
Assets\PlayFabSdk\Shared\Internal\PlayFabHttp\PlayFabWWW.cs(211,48): warning CS0618: 'WWW' is obsolete: 'Use UnityWebRequest, a fully featured replacement which is more efficient and has additional features'
It's still being used in a few places throughout PlayFab scripts, now I'm not sure if that's linked to any of the issues I've been having, but it's the first place I'm able to find something that isn't right. Just wondering if this is affecting anything and whether it's likely to be updated soon? If it's the cause of my issues with builds and an update is on the way, it'll save me from going on a wild goose chase. I'll include a screenshot of the logcat error just in case it is related and helpful.