Hi there, and thank you for your report! We've seen a few reports on this. Would you mind to provide a video? Are you doing anything specific that causes the 3rd person POV to no appear?
I will try to get a video next time it happens but it is unpredictable. It happens most often when I use shadowshot or when I emote. And the emote doesn't actually look like anything on my screen but it shows up for other people normally.
I think it happens most often when I am standing near a wall. As in this video. Though I'm not sure that's the case all the time.
Note the first time I dance and when I Dodge. Then when I dance some more it zooms out enough that you can see the back of my head.
Also, I just got it to happen on my warlock by standing next to a wall while emoting. So whatever it is, is not character specific.