Laggy and slow Camera in Portrait mode

[w2no]

hello all friends,
Got iPhone 7+ 256gb through eBay few months ago.
I noticed that when I tried to photo in Portrait mode for 20 or 30 shoots, then it becomes black/blink - right after this it s laggy and super slow!

If I closed the Camera for 10 min or so, it s back to work as normal.
But if I shoot in Portrait mode for 20 photos again, it s laggy and too slow again.

Do you have any idea? How to fix it?
On the other hand, it s under Warranty till this November. Am I entitled for the replacement of the phone?

Thank you and wait for yr advice and experience.
With respectfully thanks,

 

[simonmet]

Portrait mode is still in beta which implies Apple knows there are bugs. It's not yet finished and they're still working on it.

I wouldn't be concerned. It's extremely unlikely to be a problem with your phone if Portrait mode is the only mode affected. Portrait mode probably won't be finished until iOS 11.

Perhaps there are improvements in the upcoming iOS 10.3 also. You can test iOS 10.3 by enrolling your device in the Public Beta Program. Be warned however that unlike previous betas some people have reported difficulty rolling back to a stable release, likely because 10.3 converts the file system on the phone.

 

[Jayson A]

My camera was doing that on my old iPhone 7 Plus. It was a hardware fault and was replaced under warranty. I no longer have any issues with my current iPhone 7 Plus. Might want to consider bringing it in.

 

[w2no]

Thank you Simonmet n Jayson A for yr advise.
I got some ideas now.
Will try to pm u for some further advice,
[doublepost=1488206337][/doublepost]@Jayson A
I just sent you a conversation humbly. May you kindly help to check?
Thank you and thank you,