Semi Transparent White Circle With Lumia 1020 Picture

[scottbakertemp1488993265 0]

Guys,

I bought my wife a Lumia 1020 for her birthday.  The first one I had to return as it would lock up randomly once per day.

 

The second one has not locked up at all.

 

Anyway I've noticed out of the 50 pictures or so I've taken with both phones, 2 pictures have a semi transparent white circle in them.  Any ideas what caused that?  Am I doing something wrong?

 

I've linked to an image showing this.

 

[WolfJT 0]

That might be due to inside lighting conditions. Try some outdoor photos and see if you get the same thing