I have found a weird bug where on certain classes if you're running and face a target fast you will get "target is out of view. Spell failed" and it has a delay before you can actually cast on them. I thought it was a ping issue but on other classes this problem does not happen. Here are some videos comparing it.
https://www.twitch.tv/videos/265716192
https://www.twitch.tv/videos/265718088
https://www.twitch.tv/videos/265798694
https://www.twitch.tv/videos/265716192
https://www.twitch.tv/videos/265718088
https://www.twitch.tv/videos/265798694