Its not an issue. The flare is due to highly illuminated object and some oily or smudged lens. If you are getting the same flare in all the conditions like sunny, low light, indoor, etc then it's an issue. Try taking a pic which doesn't have a light source in it.
Here's the thing... who ever thinks that it is an user error or lens was dirty...i specifically took those shot to compare with my friends oneplus 6...image from op6 was way darker but had no flare. Similar issue has spotted in pixel(1) but for google it was issue with the glass protecting the lens but they send a patch which reduced that effect drastically that's i want Samsung to do...to send a patch that defuse these highly exposed object which is totally possible. I am not a professional photographer but i own 2 dslr so i know how those flare are generated and i can assure you that at the time of shooting these pictures lens was completely cleaned because i was surprised too seeing those huge flare!
